The following build presumes you have Harper. If not, you don't need so much INT and can boost CON or DEX instead; APs can be shifted from Harper to Assassin (Nimbleness would be nice for +5 MP).
Code:
Half-Pint Acrobat
Rogue 20
True Neutral Halfling
Stats
34pt Tome Level Up
---- ---- --------
Strength 13 +4 4: DEX
Dexterity 18 +4 8: DEX
Constitution 14 +4 12: DEX
Intelligence 16 +4 16: DEX
Wisdom 8 +4 20: DEX
Charisma 8 +4 24: DEX
28: DEX
Feats
1 : Power Attack
3 : Cleave
6 : Least Dragonmark: Healing (can be swapped for Great Cleave)
9 : Two Handed Fighting
10 Rogue : Defensive Roll
12 : Improved Critical: Bludgeoning
13 Rogue : Improved Evasion
15 : Improved Two Handed Fighting
16 Rogue : Opportunist
18 : Greater Two Handed Fighting
19 Rogue : Crippling Strike
21 Epic : Overwhelming Critical
24 Epic : Improved Sneak Attack
26 Destiny: Perfect Two Weapon Fighting
27 Epic : Great Cleave (or Precision or Improved Sunder)
28 Destiny: Perfect Two Handed Fighting
Enhancements (80 AP)
Halfling (13 AP)
- Halfling Luck
- Jorasco Dragonmark Focus III, Cunning I
- Lesser Dragonmark of Healing, Break out the Leeches, Halfling Guile
- Greater Dragonmark of Healing, Halfling Guile
Thief-Acrobat (42 AP)
- Staff Control, Stick Fighting, Tumbler, Kip Up, Cartwheel Charge, Followthrough
- Thief Acrobatics III, Fast Movement
- Quick Strike III, Haste Boost III
- Shadow Dodge III, Sweeping Strikes III
- Improved Defensive Roll III, No Mercy III, Staff Lunge I
- Staff Specialization, Spinning Staff Wall, Vault
Assassin (11 AP)
- Knife in the Darkness, Dagger in the Back, Assassin's Trick
- Sneak Attack Training, Stealthy II
- Venomed Blades II, Sneak Attack Training
Harper Agent (14 AP)
- Agent of Good I
- Harper Enchantment, Traveler's Toughness II
- Versatile Adept III, Know the Angles III
- Versatile Adept III
Destiny (24 AP)
Legendary Dreadnought
- Legendary Tactics I, Extra Action Boost III
- Momentum Swing III, Imp. Power Attack, Damage Boost III
- Lay Waste, Critical Damage III
- Lightning Mace
- Advancing Blows, Devastating Critical
- Master's Blitz
Twists of Fate (22 fate points)
- Sense Weakness (Tier 4 Fury)
- Grim Precision (Tier 3 Shadowdancer)
- Rejuvenation Cocoon (Tier 1 Primal)
If you find you don't need your halfling DMs for healing anymore, you can swap the DM feat for Great Cleave instead and take whatever you like for lvl 27 feat.
TBH, Crippling Strike is mostly useless in epics, but I like it thematically; and I don't consider the alternatives (Skill Mastery, Slippery Mind) to be any better.