Tsunami, level 12
Half-Elf, Fighter, Polearm Master
Fighter Option: Combat Superiority
Fighter Talents Option: Arena Training
Arena Training: Quarterstaff
Arena Training: Glaive
Extended Arena Training: Gauntlet Axe
Extended Arena Training: Craghammer
Background: Auspicious Birth (Auspicious Birth Benefit)
FINAL ABILITY SCORES
Str 20, Con 13, Dex 16, Int 11, Wis 16, Cha 9.
STARTING ABILITY SCORES
Str 17, Con 10, Dex 16, Int 10, Wis 22, Cha 8.
AC: 28 Fort: 27 Reflex: 22 Will: 22
HP: 101 Surges: 10 Surge Value: 50
Athletics +15, Endurance +11, Intimidate +10
Acrobatics +9, Arcana +6, Bluff +5, Diplomacy +7, Dungeoneering +9, Heal +9, History +6, Insight +11, Nature +9, Perception +9, Religion +6, Stealth +8, Streetwise +5, Thievery +8
Level 1: Staff Expertise
Level 2: Weapon Focus (Heavy Blade)
Level 4: Extended Arena Training
Level 6: Mark of Storm [Dragonmark]
Level 8: Polearm Momentum
Level 10: Polearm Gamble [retrained at 11]
Level 11: Versatile Master
Level 12: Heavy Blade Opportunity
Level 1 Dilettante: Twin Strike
Level 1 at-will: Reaping Strike
Level 1 at-will: Threatening Rush
Level 1 encounter: Bell Ringer
Level 1 daily: Tempest Dance
Level 2 utility: Glowering Threat
Level 3 encounter: Sweeping Blow
Level 5 daily: Rain of Steel
Level 6 utility: Ignore Weakness
Level 7 encounter: Come and Get It
Level 9 daily: Thicket of Blades
Level 10 utility: Clearheaded
Lightning Gauntlet Axe +2, Subtle Gauntlet Axe +2, Lightning Glaive +2, Iron Armbands of Power (heroic tier), Acrobat Boots (heroic tier), Magic Tembo Hide Armor +3, Amulet of Protection +3
This fighter has an at-will attack as follows:
Reach 3 polearm hit, slide 2 to adjacent & prone, hit again with subtle gauntlet axe
Reach 3 polearm hit, slide 2 to adjacent & prone, hit another target with reach 2 lightning gauntlet axe, slide 1 to adjacent
That's +17vAC, 2d4+6 damage on the first hit, and +19vAC 1d8+8 damage on the second (with CA) and is adjacent, prone and marked
Or +17vAC, 2d4+6 damage on the first hit, and +17vAC 1d8+6 damage on the second target and they are both adjacent and marked, and the first is prone
He can use this attack on his turn, on opportunity attacks, and whenever an enemy moves from non-adjacent to adjacent.
He can also slide adjacent & prone on all of his other attacks, including Combat Challenge.
HOW IT WORKS
This build exploits a couple RAW loopholes that lets it combine Twin Strike with a Polearm as well as adding additional reach to a reach weapon. First, Twin Strike says "you must be wielding two melee weapons or a ranged weapon." This excludes two-handed weapons, and attempting to use a Fighting Shield won't work because you can't wield a two-handed weapon with a light shield.
This is where you add in the Gauntlet Axe. It explicitely says it keeps the hand free, says it "can also serve as a light shield", which means it doesn't have to, and it says "when enchanted as a magic weapon, it does not occupy a character's arm slot" which means I can still use Iron Armbands of Power. This means I can be wielding both a Polearm and a Gauntlet Axe for Twin Strike. It's also defensive, off-hand, and an axe, which works with Headsman's Chop.
The other trick is adding reach to my Glaive. Arena Training fighter talent says "any of your feats that grant feat bonuses to attack rolls or damage rolls with one of your arena weapons apply to your other arena weapon as well." While this was likely RAI to mean that the feat bonuses apply to both weapons, RAW it says the entire feat applies, so long as it qualifies. Therefore, selecting my arena weapons as Glaive and Quarterstaff allows me to apply Staff Expertise to my Glaive - which has the benefit "when you make a melee weapon attack with a staff, the weapon's reach for that attack increases by 1". Therefore, melee weapon attacks with my Glaive also gain +1 reach.
Other neat combinations include Full Extension for reach 4 for an attack per encounter, and Reaching Stance for reach 3 on opportunity attacks for an encounter each day. The level 16 Polearm Master feature allows me to apply reach to Combat Challenge as well!
So that's the build. Incredibly feat intensive and pins down your race, class, weapons and half your items, and has not so great defenses. However, it has Reach +2 Twin Strike with Polearm Shenanigans to make you a swirling, crackling, lightning tornado of death.
I look forward to hearing any flaws in my logic, any way of patching the gaping holes in the character design and any and all feedback.
Updated feat order, ability scores, item choices and to hit/damage calculations. Power selection changed to emphasize multi-marking and ignoring status conditions. Figured out I didn't need to use Rushing Cleats to get the target adjacent, got Acrobat Boots instead to stay on my feet. Starting to look pretty good!