I'm just curious, but wouldn't a jagged weapon be better? Avengers seem to get twice the amount of criticals, however I don't see a way to improve their critical range to 19-20 until epic level (besides using weapons, which would be hard while using a wraith blade).
This should do the trick! Avenger + Twin Strike + Sneak of Shadows + Daggermaster + Wraithblades ftw! 1d4+3 for a regular attack, 1d4+3+3d8 (SA) + 3d6 (crit bonus) [10-49] per attack. Also, if you crit with any Melee Avenger power, or the first Twin Strike attack, make an extra-offhand attack!
And for Epic Cheese, Punisher of the Gods!
Level 12
Half-Elf, Avenger, Daggermaster
Build: Pursuing Avenger
Avenger's Censure: Censure of Pursuit
Background: Cormyr (General)
FINAL ABILITY SCORES
Str 18, Con 13, Dex 15, Int 11, Wis 19, Cha 11.
Starting Ability Scores
Str 15, Con 10, Dex 13, Int 10, Wis 17, Cha 8.
AC: 25 Fort: 22 Reflex: 21 Will: 22
HP: 87 Surges: 8 Surge Value: 21
TRAINED SKILLS
Religion, Stealth, Athletics, Perception, Thievery.
FEATS
1: Sneak of Shadows
2: Improved Armor of Faith
4: Two-Weapon Fighting
6: Backstabber
8: Two-Weapon Defense
10: Weapon Expertise (Light Blade)
11: Versatile Master
12: Two-Weapon Opening
POWERS
1, At-Will: Bond of Pursuit
1, At-Will: Overwhelming Strike
1, At-Will: Twin Strike
1, Encounter: Angelic Alacrity
1, Daily: Aspect of Might
2, Utility: Refocus Enmity
3, Encounter: Deflecting Thunder
5, Daily: Executioner's Cloak
6, Utility: Aspect of Agility
7, Encounter: Blade Step
9, Daily: Enduring Strike
10, Utility: River of Life
ITEMS
Wraithblade Dagger +2 (2)
On another note I do allow how Wraithblade allows people to make dagger builds easier to do with classes other then the Rogue. Since we have the person who made up the weapon here though, would such a weapon if used as an implement allow Sorcerers to add sneak attack on their criticals? Strictly be rules rather then intention (I doubt it if you meant it by intention, but please say if you did).
Sneak Attack simply requires that you use a light blade, sling, or crossbow (or other weapons that are opened up by feats such as Street Thug); the only requirement for the Wraithblade is that you need the SA class feature.
One question though, how does the Wraithblade work with the Rogue's Hybrid Class Sneak Attack feature; if this allows circumvention of that, then things can get super cheesy!