The point of the Ninja build is to be stealthy and hidden and full of Rogue flavor, while wielding a larger weapon. I've focused on the Spiked Chain as a flavorful weapon that can be used with Rogue powers.
Thuranni Shadow Killer gives ongoing 5 once/round as an additional striker damage feature. This should work out to about 8/rnd extra damage, increasing to 15/rnd extra damage at 21st level. Your spike damage turn goes something like "Ready the Final Blow; AP: Decending Shadows; Fury's Advance", applying the Half Orc bonuses on any of those attacks.
Tomph, level 30Half-Orc, Avenger, Thuranni Shadow Killer, Punisher of the Gods Build: Pursuing Avenger Avenger's Censure: Censure of Pursuit Background: Windrise Ports (Windrise Ports Benefit)
FINAL ABILITY SCORES Str 18, Con 14, Dex 24, Int 12, Wis 24, Cha 10.
STARTING ABILITY SCORES Str 12, Con 12, Dex 16, Int 10, Wis 16, Cha 8.
AC: 48 Fort: 38 Reflex: 41 Will: 41 HP: 202 Surges: 9 Surge Value: 50
TRAINED SKILLS Religion +21, Acrobatics +27, Perception +27, Stealth +42, Thievery +27
UNTRAINED SKILLS Arcana +16, Bluff +15, Diplomacy +15, Dungeoneering +22, Endurance +19, Heal +22, History +16, Insight +22, Intimidate +17, Nature +22, Streetwise +15, Athletics +22
FEATS Level 1: Melee Training (Wisdom) Level 2: Mark of Shadow Level 4: Spiked Chain Training Level 6: Sneak of Shadows Level 8: Weapon Expertise (Light Blade) Level 10: Nimble Blade Level 11: Surprising Charge Level 12: Armor Proficiency (Leather) Level 14: Improved Armor of Faith Level 16: Invigorating Pursuit Level 18: Skill Focus (Stealth) Level 20: Strength From Pain Level 21: Light Blade Mastery Level 22: Epic Resurgence Level 24: Robust Defenses Level 26: Acolyte Power Level 28: Weapon Focus (Light Blade) Level 30: Divine Rage
POWERS Avenger at-will 1: Bond of Pursuit (retrained to Bond of Retribution at Level 20) Avenger at-will 1: Overwhelming Strike Avenger encounter 1: Avenging Echo Avenger daily 1: Aspect of Might Avenger utility 2: Distracting Flare Avenger encounter 3: Fury's Advance Avenger daily 5: Living Death Strike Avenger utility 6: Soul Seeker Avenger encounter 7: Inexorable Pursuit Avenger daily 9: Temple of Shadow Avenger utility 10: River of Life Avenger encounter 13: Inexorable Pursuit (replaces Avenging Echo) Avenger daily 15: Aspect of Fury (replaces Living Death Strike) Avenger utility 16: Astral Cloak (retrained to Hide in Plain Sight at Acolyte Power) Avenger encounter 17: Ready the Final Blow (replaces Inexorable Pursuit) Avenger daily 19: Oath of the Inevitable Blade (replaces Aspect of Fury) Avenger utility 22: Ghostly Vengeance Avenger encounter 23: Bond of Justice (replaces Inexorable Pursuit) Avenger daily 25: Executioner's Justice (replaces Temple of Shadow) Avenger encounter 27: Inevitable End (replaces Bond of Justice) Avenger daily 29: Final Oath (replaces Oath of the Inevitable Blade)
ITEMS Shadowflow Starleather Armor +6, Bloodclaw Spiked chain +6, Distance Dagger +5, Siberys Shard of Radiance (epic tier), Symbol of Victory +3, Iron Armbands of Power (epic tier), Boots of Teleportation (epic tier), Gauntlets of Destruction (paragon tier), Horned Helm (epic tier), Elven Cloak +6, Shadow Band (epic tier), War Ring (paragon tier), Belt of Titan Strength (epic tier), Solitaire (Violet) (epic tier), Potion of Clarity (level 5) (5)