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Hey people, I'm working on an adventure set in the Castlevania world.
All the PCs of my home game are level 20, well equipped and fairly optimized, and they're going to be sucked into Dracula's Castle by a malfunctioning portal. 
I'm refluffing a lot of existing monsters to recreate the classical castlevania enemies, but I'm also creating some stuff on my own.
Let's start with some minions:

Flea Man                                                   Level 20 Minion Lurker
Small fey humanoid                                                               XP 700

HP 1; a missed attack never damages a   minion.	Initiative +21
AC 34, Fortitude 31, Reflex 35, Will 30	Perception +18
Speed 8

Traits
Hopper
The flea man cannot be targeted by an attack unless it is the nearest enemy to the attacker.
Standard Actions
m/r Distracting Axe (weapon)  At-Will
Attack: Melee 1 or Ranged 5/10 (one creature); +25 vs. AC
Hit: 14 damage. Choose one of the flea man’s allies within 5 squares of the target. Until the end of the target’s next turn, the target is marked by that creature. In addition, if the target has any creatures marked, those marks end.
Skills Athletics +16, Acrobatics +22
Str 13 (+11) Dex 25 (+17) Wis 16 (+13)
 Con 18 (+14) Int 8 (+9) Cha 8 (+9)
Alignment evil        Languages Deep Speech

Flea men in castlevania are fast, annoying, and very hard to catch, and that's the feeling i want to recreate.

Medusa Head                                      Level 20 Minion Controller
Small naturall animate (undead)                                          XP 700

Initiative +17        Senses Perception +19
, Darkvision
HP 1; a missed attack never damages a minion.
AC 34; Fortitude 32, Reflex 34, Will 30
Immune disease, poison
Speed 1, fly 8 (hover)
Traits
Petrifying Essence
Whenever the medusa head hits a slowed target with a bite attack, the target is also immobilized until the end of the medusa head’s next turn.
If the target was already immobilized, it is also restrained until the end of the medusa head’s next turn.
If the target was already restrained, it is also dazed until the end of the medusa head’s next turn.
If the target was already restrained and dazed, it is also petrified until the end of the medusa head’s next turn
Standard Actions
m Bite (standard, at-will) +23 vs Fortitude; 14 damage and the target is pushed 1 and slowed until the end of the medusa head’s next turn
Alignment Evil       Languages None
Str 10 (+10) Dex 24 (+17) Wis 20 (+15) 
Con 18 (+14) Int 6 (+8) Cha 8 (+9)

I want the medusa heads to petrify their victims like in the game, but petrified it's a very powerful control effect, so I created a slippery slope. The more you get hit by them, the worse the effect becomes, until you're finally petrified for a brief period. 

Merman                                                                 Level 20 Minion Artillery
Medium natural humanoid (aquatic)                                                    XP 700

HP 1; a   missed attack never damages a minion.	Initiative +16
AC 32, Fortitude 31, Reflex 33, Will 32	Perception +18
Speed 6, swim 8	Darkvision

Standard Actions
m Bite At-Will
Attack: Melee 1 (one creature); +25 vs. AC
Hit: 11 damage.
A Fireball At-Will
Attack: Area burst 2 within 10; creatures in the burst; +25 vs. Reflex
Hit: 11 fire damage.
Triggered Actions
Desperate Escape At-Will
Trigger: The merman is hit or missed by a close or an area attack.
Effect (Immediate Interrupt): The merman shifts 2 squares and falls prone at the end of the movement.
Str 18 (+14) Dex 22 (+16) Wis 17 (+13)
 Con 17 (+13) Int 8 (+9) Cha 10 (+10)
Alignment evil        Languages Deep Speech

Fairly standard artillery with a twist: the mermen can be hard to catch with area/close attacks, but they end up prone in return for dodging an attack.

Skeleton Archer                                          Level 20 Minion Skirmisher
Medium natural animate (undead)                                                     XP 700

HP 1; a   missed attack never damages a minion.	Initiative +17
AC 34 (36   against opportunity attacks), Fortitude 33, Reflex 32, Will 31	Perception +14
Speed 6 Resist 10   necrotic	Darkvision
Immune disease,   poison

Standard Actions
m Claw(Weapon)  At-Will
Attack: Melee 1 (one creature); + 25 vs. AC
Hit: 14 damage.
r Shortbow (Weapon)  At-Will
Attack: Ranged 15/30 (one creature); + 25 vs. AC
Hit: 14 damage.
Move Actions
Shifting Strike  At-Will
Requirement: The deathguard must have attacked in this round.
Effect: The deathguard shifts 2 squares.
Str 23 (+16) Dex 20 (+15) Wis 19 (+14)
 Con 20 (+15) Int 5 (+7) Cha 9 (+9)
Alignment Unaligned        Languages -
Equipment: bone arrows x20, shortbow .

The skeleton is designed as an all-purpose minion, good for every kind of battle. No flashy abilities, it's just a regular skeleton. it's based on an already existing minion, the deathguard skeleton.

Skull Ghost                                             Level 20 Minion Brute
Medium shadow animate (undead)                                   XP 700

HP 1; a   missed attack never damages a minion.	Initiative +15
AC 32, Fortitude 34, Reflex 32, Will 31	Perception +14
Speed 6 (hover)	Darkvision
Immune disease,   poison; Resist 10 necrotic

Standard Actions
m Ghostly TouchAt-Will
Attack: Melee 1 (one creature); + 23 vs. Reflex
Hit: 18 necrotic and fire damage.
Triggered Actions
M Death Hold
Trigger: The skull ghost drops to 0 hit points.
Effect: The ghost can shift 1 square before the attack.
Attack (No Action): Melee 1 (one creature); + 23 vs. Reflex
Hit: The target is grabbed and takes 10 ongoing necrotic and fire damage as long as it is grabbed. The ghost is still alive and it’s immune to all damage. It cannot take actions during its turn, but it doesn’t need to take actions to sustain the grab. It can still be targeted by attacks and it dies when the grab ends.
Str 21 (+15) Dex 20 (+15) Wis 19 (+14)
 Con 18 (+14) Int 3 (+6) Cha 6 (+8)
Alignment Unaligned        Languages -

I like this one a lot. An high-damage, low AC minion that can still annoy the PCs after his death. It's a ghost, after all!

Vampire Bat Swarm                                          Level 20 Minion Soldier
Medium natural beast (swarm)                                                       XP 700

HP 1; a missed attack never damages a   minion.	Initiative +20
AC 36, Fortitude 31, Reflex 34, Will 31	Perception +20
Speed fly 8 (hover)	Blindsight 10

Traits
Swarm Attack  Aura 2
Any enemy that starts its turn within the aura takes 5 damage.
Standard Actions
m Blood Drain  At-Will
Attack: Melee 1 (one creature); +23 vs. Fortitude
Hit: 9 damage, and the target is weakened until the end of the swarm’s next turn.
Str 14 (+12) Dex 26 (+18) Wis 21 (+15)
 Con 17 (+13) Int 2 (+6) Cha 11 (+10)
Alignment Unaligned        Languages -

It isn't Castlevania without bats. These soldier minions can't mark, but since their attacks weaken, the PCs will probably try to get rid of them early. Which is exactly the purpose of soldier monsters!

Please give me your opinions! 

Thanks! Here are some standard monsters.

Axe Knight                                                                Level 20 Controller
Large immortal animate (construct)                                              XP 2800

HP 191; Bloodied 95	Initiative +18
AC 34, Fortitude 32, Reflex 33, Will 32	Perception+16
Speed 5	Darkvision
Immune disease,   poison
Saving Throws +2 against ongoing damage

Standard Actions
m Axe Swing  At-Will
Attack: Melee 2 (one creature); +25 vs. AC
Hit: 4d6 + 14 damage, and the target is dazed until the start of the guardian’s next turn.
r Axe Throw At-Will
Attack: Ranged 5/10 (one creature); +25 vs. AC
Hit: 3d8 +15 damage, and the target falls prone and is pushed 2 squares.
M Shield Slam  Recharge 4-5-6
Effect: The guardian uses axe swing. On a hit, the target falls prone and the guardian gains a +2 bonus to all defenses until the end of its next turn.
M Wave of Steel  Recharge when the guardian uses shield slam
Effect: The guardian charges and makes the following attack in place of a basic attack.
Attack: Melee 2 (one creature); +23 vs. Fortitude
Hit: 3d12 + 14 damage, and the target falls prone and is stunned (save ends).
Triggered Actions
Relentless Pursuit  At-Will
Trigger: A creature adjacent to the guardian moves or shifts.
Effect (Immediate Reaction): The guardian shifts to stay adjacent to the triggering creature.
Str 21 (+15) Dex 26 (+18) Wis 23 (+16)
 Con 23 (+16) Int 12 (+11) Cha 13 (+11)
Alignment Unaligned        Languages -

I used the armor guardian from tomb of horrors as a starting point and changed some stuff. I kinda like the result. Edit: I changed the monster type to controller and tweaked it a bit.

Bone Pillar                                                                       Level 20 Artillery
Medium elemental animate (fire, undead)                                      XP 2.800

HP 150; Bloodied 75                                         Initiative +17
AC 34, Fortitude 35, Reflex 26, Will 34           Perception +17, Darkvision
Speed 0
Immune disease, poison; Resist 20 fire, 10 necrotic
Traits
Unmovable Pillar
The bone pillar cannot be forced to leave his square in any way. It is unaffected by the immobilized, prone, restrained, slowed and removed from play conditions. Its initiative bonus is based on wisdom instead of dexterity.
All-Around Vision
Enemies can’t gain combat advantage by flanking the bone pillar.
Standard Actions
r Scorching Bolts (fire) • At-Will
Attack: Ranged 20 (one or two creatures); +25 vs. Reflex
Hit: 3d6 + 8 fire damage, ongoing 10 fire damage (save ends) and the target is pushed 2 squares. This attack doesn’t provoke attacks of opportunity.
C Fire Breath (fire) • Recharge 5-6
Attack: Close Blast 5 (creatures in burst); +23 vs. Reflex
Hit: 4d6 + 13 fire damage, and if the target has ongoing fire damage, the ongoing damage increases by 5.
A Rain of Fire (fire) • Recharge when first bloodied
Attack: Area burst 2 within 10 (creatures in burst); +25 vs. Reflex
Hit: 4d8 + 13 fire damage, and the bone pillar slides the target 3 squares.
Str 8(+9) Dex 2 (+6) Wis 24 (+17) Con 24 (+17) Int 5 (+7) Cha 6 (+7)
Alignment evil             Languages -
It wasn't easy to stat this guy. An immobile artillery monster is kind of a weird concept. I think they can work well, though.

Many existing monsters work fine out of the box. The succubus and the stone golem (both from MV) just needed a level increase to be perfect.

Now here's a boss, the Bone Golem from Rondo of Blood/Dracula X Chronicles. This is a video of the boss fight against him.
I wanted this boss to change form like in the video game, so I used the multi-stage boss system created by the AngryDM.

Bone Golem, (First Form)                                            Level 21 Solo Soldier
Huge natural animate (construct)                                                               XP -

HP 267	Initiative +19
AC 37, Fortitude 34, Reflex 32, Will 33	Perception +18
Speed 7	Darkvision
Immune disease, poison Resist 20 fire
Saving Throws +5; Action Points 1

Traits
Action Recovery
Whenever the golem ends its turn, any dazing, stunning, or dominating effect on it ends.
Instinctive Assault
On an initiative of 10 + its initiative check, the golem can use a free action to use bite or claw. If the golem cannot use a free action to make this attack due to a dominating or stunning (or other) effect, then that effect ends instead of the golem making the attack.
Standard Actions
m Bite (fire)  At-Will
Attack: Melee 3 (one creature); +26 vs. AC
Hit: 3d10 + 13 damage. The target is grabbed and takes ongoing 15 fire damage until the grab ends.
M Claw  At-Will
Attack: Melee 3 (one or two creatures); +26 vs. AC. If the golem targets only one creature, it can make this attack twice against that creature
Hit: 3d10 + 13 damage, and the golem grabs the target if it has fewer than two creatures grabbed.
R Immolate Foe (fire)  Recharge  5-6
Attack: Ranged 20 (one creature); +24 vs. Reflex
Hit: 4d10 + 6 fire damage, and ongoing 20 fire damage (save ends).
Miss: Half damage, and ongoing 10 fire damage (save ends).
C Breath Weapon (fire)  Recharge  5-6
Attack: Close blast 5 (creatures in the blast); +24 vs. Reflex
Hit: 4d12 + 16 fire damage.
Miss: Half damage.
Triggered Actions
M Long Arm Attack  At-Will
Trigger: An enemy leaves a square within 3 squares of the golem.
Attack (Immediate Reaction): Melee 4 (the triggering enemy); +24 vs. Reflex
Hit: 2d8 + 4 damage, and the target falls prone.
C Recombination  At-Will
Trigger: The golem is reduced to 0 or fewer HP.
Special: The golem may use this power even if a condition exists that would normally prevent it from doing so.
Effect (No Action): Breath weapon recharges, and the golem uses it.
Effect: The golem teleports up to 10 square and must end this movement airborne.
Effect: The bone golem (first form) is removed from the battlefield and replaced with a bone golem (second form). The new golem rolls initiative and fights normally as a new creature entering combat.
Str 26 (+18) Dex 21 (+15) Wis 17 (+13)
 Con 24 (+17) Int 8 (+9) Cha 11 (+10)
Alignment evil        Languages none

 
Bone Golem, (Second Form)                                      Level 21 Solo Skirmisher
Huge natural animate (construct)                                                                      XP -

HP 266	Initiative +18
AC 35, Fortitude 32, Reflex 35, Will 32	Perception+18
Speed 4, fly 8 (hover)	Darkvision
Immune disease, poison
Saving Throws +5; Action Points 1

Traits
Action Recovery
Whenever the golem ends its turn, any dazing, stunning, or dominating effect on it ends.
Instinctive Assault
On an initiative of 10 + its initiative check, the golem can use a free action to use bite. If the golem cannot use a free action to make this attack due to a dominating or stunning (or other) effect, then that effect ends instead of the golem making the attack.
Standard Actions
m Bite  At-Will
Attack: Melee 3 (one creature); +26 vs. AC
Hit: 4d8 + 11 damage, and the purple worm shifts up to half its speed.
Move Actions
M Explosive Charge  At-Will
Effect: The golem shifts up to its speed. Each time the golem enters a square adjacent to any enemy for the first time during the move, it makes the following attack against that enemy.
Attack: Melee 1 (one creature); +24 vs. Reflex
Hit: 3d8 + 9 damage, and the golem pushes the target up to 2 squares.
Minor Actions
M Tail Smash (poison)  At-Will
Attack: Melee 3 (one creature); +26 vs. AC
Hit: 2d8 + 10 damage, and the golem slides the target up to 4 squares. The target takes ongoing 10 poison damage (save ends).
Triggered Actions
M Flail  At-Will
Trigger: An attack hits the golem.
Attack (Immediate Reaction): Melee 3 (one or two creatures); +24 vs. Reflex
Hit: 2d12 + 13 damage, and the golem pushes the target up to 6 squares.
C Recombination  At-Will
Trigger: The golem is reduced to 0 or fewer HP.
Special: The golem may use this power even if a condition exists that would normally prevent it from doing so.
Effect: The golem gains unlimited flying speed and an unlimited burrow speed for the duration of this action.
Effect (No Action): The golem must use explosive charge, using its movement to fly in a straight line to the closest ground square. Then, the golem must burrow 3 squares underground.
Effect: The bone golem (second form) is removed from the battlefield and replaced with a bone golem (third form). The new golem rolls initiative and fights normally as a new creature entering combat.
Str 24 (+17) Dex 23 (+16) Wis 17 (+13)
 Con 24 (+17) Int 8 (+9) Cha 11 (+10)
Alignment evil        Languages none

Bone Golem, (Third Form)                                                    Level 21 Solo Brute
Large natural animate (construct)                                                              XP 16000

HP 272	Initiative +14
AC 35, Fortitude 35, Reflex 32, Will 32	Perception+19
Speed 6, burrow 6 Immune disease, poison	Darkvision
Resist 20 necrotic Saving Throws +5; Action Points 1

Traits
Bloodied
The golem is considered bloodied, regardless of its hit point total.
Action Recovery
Whenever the golem ends its turn, any dazing, stunning, or dominating effect on it ends.
Instinctive Assault
On an initiative of 10 + its initiative check, the golem can use a free action to use soulrending claws or bite. If the golem cannot use a free action to make this attack due to a dominating or stunning (or other) effect, then that effect ends instead of the golem making the attack.
All-Around Vision
Enemies can’t gain combat advantage by flanking the golem.
Standard Actions
m Soulrending Claws (Necrotic)  At-Will
Attack: Melee 2 (one creature); +26 vs. AC
Hit: 4d10 + 14 damage plus 2d6 necrotic damage, or 3d10 + 54 damage plus 12 necrotic damage on a critical hit. In addition, the target takes a -2 penalty to AC until the end of the encounter. This penalty is cumulative to a limit of -5.
M Bite (Poison)  At-Will
Attack: Melee 2 (one creature); +24 vs. Reflex
Hit: 5d6 + 5 damage, and the golem makes a secondary attack against the target.
Secondary Attack: Melee 2; +24 vs. Fortitude
Hit: The target is weakened and takes ongoing 30 poison damage (save ends both).
M Destructive Rampage  At-Will
Effect: The golem uses soulrending claws two times and bite once in any order. It cannot use more than two attacks on the same target.  The golem can shift 2 squares after each attack.
Triggered Actions
Mauling Outburst  At-Will
Trigger: The golem drops to 0 hit points.
Effect (Free Action): The golem uses destructive rampage.
Str 28 (+19) Dex 19 (+14) Wis 19 (+14)
 Con 28 (+19) Int 8 (+9) Cha 11 (+10)
Alignment Evil       Languages -

So it's basically a refluffed combination of a red dragon (MV), a purple worm (MV) and a rampager (DSCC). A scary and dynamic solo, I hope.

More standard monsters.

Poltergeist                                                                    Level 21 Skirmisher
Large natural animate (undead, swarm)                                            XP 3200

HP 197; Bloodied 98	Initiative +17
AC 35 (33 while bloodied), Fortitude 33, Reflex 34, Will 32	Perception +17
Speed 10, fly 5	Blindsight 20
Resist half damage from melee and ranged attacks Vulnerable 10 against close and area attacks

Traits
Slashing Aura Aura 1, Aura 2 while bloodied
An enemy that starts its turn in the aura takes 10 damage, or 15 while the poltergeist is bloodied.
Swarm
The poltergeist can occupy the same space as another creature, and an enemy can enter its space, which is difficult terrain. The poltergeist cannot be pulled, pushed, or slid by melee or ranged attacks. It can squeeze through any opening that is large enough for at least one of the creatures it comprises.
Freedom of Movement
The poltergeist does not provoke opportunity attacks when it moves, and any immobilizing or slowing effects on it end at the start of its turn.
Standard Actions
m Weapon Fury At-Will
Attack: Melee 1 (one creature); +26 vs. AC Hit: 2d8 + 10 damage.
M Rush of Blades At-Will
Effect: The poltergeist shifts up to 5 squares and makes the following attack at any point during this movement.
Attack: Melee 1 (one creature); +26 vs. AC
Hit: 2d8 + 10 damage.
C Steel Whirlwind Recharge when first bloodied
Attack: Close burst 1, or 2 if the poltergeist is bloodied (enemies in the burst); +24 vs. Reflex
Hit: 4d8 + 20 damage.
Miss: Half damage.
Triggered Actions
C Death's Rage Encounter
Trigger: The poltergeist dies.
Attack (No Action): Close burst 5 (enemies in the burst); +24 vs. Will
Hit: The target makes a basic attack against its nearest ally as a free action.
Str 18 (+14) Dex 21 (+15) Wis 14 (+12)
 Con 21 (+15) Int 14 (+12) Cha 18 (+14)
Alignment Chaotic Evil        Languages -

This is based on the ragewind (from the nentir vale MV), but I changed it into a swarm. Edit: Steel whirlwind now attacks reflex instead of AC.


Plate Lord                                                         Level 21 Brute
Large immortal animate (construct)                              XP 3200

HP 243; Bloodied 121	Initiative +15
AC 33, Fortitude 35, Reflex 30, Will 33	Perception +16
Speed 5	Darkvision
Immune disease,   poison Saving Throws +2 against ongoing damage

Standard Actions
m Iron Ball  At-Will
Attack: Melee 4 (one creature); +26 vs. AC
Hit: 2d10 + 9 damage, and the plate lord pushes the target 2 squares.
M Iron Flurry  At-Will
Effect: The plate lord uses iron ball twice.
Triggered Actions
C Ferocious Spin  Recharge when first bloodied
Trigger: An enemy hits the plate lord with a melee attack.
Attack (Immediate Reaction): Close burst 1; +24 vs. Reflex.
Hit: Damage equal to half the damage of the triggering attack.
Str 26 (+18) Dex 21 (+15) Wis 23 (+16) 
Con 23 (+16) Int 10 (+10) Cha 10 (+10)
Alignment unaligned        Languages -

Legion, Granfaloon                                                                  Level 23 Solo Brute
Gargantuan immortal animate (undead)                                                        XP 25500

    

HP 444 (each section, see below); Bloodied 222	Initiative +17
AC 37, Fortitude 36, Reflex 33, Will 36	Perception +22
Speed fly 1 (hover, altitude limit 1)	Darkvision; Blindsight 10
Immune disease, poison, radiant (core only, see below) Resist 20 necrotic Vulnerable 10   radiant (outer sections only, see below)
Saving Throws +5; Action Points 2

Traits
Composed of Many
The granfaloon is represented on the battle grid as an 8x8 squares cube. It is divided in 8 identical, separated outer sections, each one a 4x4 squares cube, and the core, a 2x2 squares cube placed at the center of the 8x8 cube, sharing its space with the inner squares of the outer sections. Each outer section and the core have 444 HP. They all track damage separately, but are considered a single creature as a whole. The granfaloon’s core cannot be attacked if one of the outer sections blocks the line of effect. This means that at least one of the outer sections must be destroyed before the core is exposed and attackable. The granfaloon is defeated once the core is reduced to 0 HP.
Holy Weakness
All the outer sections of the granfaloon are vulnerable 10 to radiant damage, and whenever one of the outer sections takes radiant damage all the other outer sections take the same amount of damage. The core section is immune to radiant damage.
Unspeakable Terror
The granfaloon cannot be forced move in any way. It is unaffected by the immobilized, prone, restrained, slowed, blinded, weakened and removed from play conditions. If the granfaloon is stunned, dominated, petrified or knocked unconscious, it is dazed for the same duration instead. Its initiative bonus is based on wisdom instead of dexterity.
All-Around Vision
Enemies can’t gain combat advantage by flanking the granfaloon.
Nightmarish Creature
On an initiative of 10 + its initiative check, the granfaloon can use use tentacle laser or grasp of the grave as a no action.
Standard Actions
m Grasp of the Grave  At-Will
Attack: Melee 1 (one creature); +28 vs. AC.
Hit: 4d6 + 23 necrotic damage, and the granfaloon grabs the target.
C Shower of Bodies At-Will
Attack: Close Burst 3; +26 vs. Fortitude
Hit: 3d10 + 13 damage and the target falls prone.
Effect: Up to 12 legion zombies appear in the targeted area. They can act immediately after the granfaloon’s turn.
C Tentacle Laser (radiant)  At-Will
Requirement: The origin square for this attack must be the core, and this attack cannot include sections of the granfaloon in the attack area.
Attack: Close blast 10 (creatures in the blast); +26 vs. Reflex
Hit: 3d12 + 10 radiant damage.
Triggered Actions
C Critical Damage  At-Will
Trigger: All the outer sections of the granfaloon are destroyed.
Special: The granfaloon may use this power even if a condition exists that would normally prevent it from doing so.
Effect (No Action): The granfaloon uses shower of bodies.
Effect: The granfaloon fly speed rises to 8, with no altitude limit.
Effect: The granfaloon cannot use shower of bodies and grasp of the grave anymore. Tentacle laser is now a close burst 15 attack that can be used as a minor action.
Str 30 (+21) Dex 1 (+6) Wis 23 (+17)
 Con 30 (+21) Int 11 (+11) Cha 24 (+18)
Alignment evil        Languages none

Legion Zombie                                             Level 23 Minion Brute
Medium natural animate (undead)                                               XP -

HP 1; a missed attack never damages a minion.	Initiative +10
AC 35, Fortitude 35, Reflex 31, Will 31	Perception +15
Speed 5	Darkvision
Immune disease, poison; Resist 10 necrotic; Vulnerable 5 radiant

Standard Actions
m Suicidal CollisionAt-Will
Attack: Melee 1 (one creature); + 24 vs. Reflex
Hit: 4 damage and the legion zombie explodes, dealing 5 necrotic damage to all creatures adjacent to it. This attack ignores resistances, but undead allies of the zombie are immune to it.
Effect: The legion zombie drops to 0 hit points.

Str 21 (+16) Dex 8 (+10) Wis 19 (+15)
 Con 18 (+15) Int 3 (+7) Cha 6 (+8)
Alignment Unaligned        Languages -

This was hard to create. If anyone's confused with how it works, don't hesitate to ask for clarification. Edit: Halved the zombies' damage, but twice of them appear after shower of bodies. 

Here's a video of the bossfight in castlevania SOTN, watching this probably explains a lot of my design choices. Btw, Shadowserg is willingly beating the boss the hard way (destroying all the outer sections first). You can kill the core earlier and win way faster.

 

Thank you! By the way, my Castlevania adventure has finally started, so I playtested some of these monsters against my players.
The minions look fine and fun, and the sword lord and bone golem really impressed them for their ability to transform during the battle. I can't wait for them to meet the granfaloon!

I also refluffed an elder green dragon as a water serpent. Here's the result:

Water Serpent                                                 Level 21 Solo Skirmisher
Huge natural magical beast                                                        XP 16000

HP 788; Bloodied 394	Initiative +20
AC 35, Fortitude 33, Reflex 35, Will 31	Perception +18
Speed 1, fly 14,   swim 14	Darkvision
Resist 20 poison
Saving Throws +5; Action Points 2

Traits
Poisonous Wounds (poison)  Aura 2
While the serpent is bloodied, any enemy that ends its turn in the aura takes ongoing 10 poison damage (save ends). This damage increases to 20 if that enemy is bloodied.
Action Recovery
Whenever the serpent ends its turn, any dazing, stunning, or dominating effect on it ends.
Instinctive Flyby
On an initiative of 10 + its initiative check, the serpent can use a free action to use flyby attack. During the movement from flyby attack, the serpent gains a +4 bonus to all defenses against opportunity attacks. If the serpent cannot use a free action to make this attack due to a dominating or stunning (or other) effect, then that effect ends instead of the serpent making the attack.
Clumsy Flier
If the water serpent ends its turn in the air, it falls down.
Standard Actions
m Bite (poison)  At-Will
Attack: Melee 3 (one creature); +26 vs. AC
Hit: 3d10 + 18 damage, and ongoing 10 poison damage (save ends).
Miss: 15 poison damage.
M Tail Sweep At-Will
Attack: Melee 3 (one or two creatures); +26 vs. AC. If the serpent targets only one creature, it can make this attack twice against that creature
Hit: 4d6 + 15 damage, and the serpent shifts up to 2 squares.
M/C Flyby Attack At-Will
Effect: The serpent flies up to its speed and uses bite or poisonous spit (if the power is recharged) at any point during the move.
C Poisonous Spit (poison)  Recharge 5-6
Attack: Close blast 5 (enemies in the blast); +24 vs. Fortitude
Hit: 2d12 + 14 poison damage, and the target is slowed and takes ongoing 15 poison damage (save ends both).
Aftereffect: The target is slowed (save ends).
Minor Actions
C Luring Glare (charm)  At-Will
Attack: Close blast 10 (one creature in the blast); +24 vs. Will
Hit: The serpent slides the target up to 3 squares.
Triggered Actions
Cunning Glance  At-Will
Trigger: An enemy shifts to a square within 2 squares of the serpent.
Effect (Immediate Reaction): The serpent uses luring glare against the triggering enemy.
Bloodied Spit  Encounter
Trigger: The serpent is first bloodied.
Effect (Free Action): Poisonous Spit recharges, and the serpent uses it.
Skills Athletics +21, Insight +18, Stealth +23
Str 23 (+16) Dex 26 (+18) Wis 16 (+13)
 Con 21 (+15) Int 12 (+11) Cha 14 (+12)
Alignment evil        Languages Draconic

Here's the battle against this boss in the game.