So I wanted to mix it up with the leader of the Vecna cult. I decided I would have him able to adopt the face of people that attacked him, and have the confusion in combat represented by an ability of his.
As I recall, it ended up working pretty well, if a bit unconventional from the rules standard. In retrospect, I would have changed this to just be an immediate fear attack against the person hitting him, and dropped the potential confusion.
It was interesting, but not interesting enough.
Faceless One
Level 4 Elite Artillery (Leader)
Medium natural humanoid XP 350
Initiative +4 Senses Perception +5
HP 84; Bloodied 42
AC 19; Fortitude 15, Reflex 16, Will 17
Speed 6
Action Points 1
Saving Throws +2
Quarterstaff (standard; at-will) ✦ Weapon
+6 vs. AC; 1d8 damage
Secret of Fire (standard; at-will) ✦ Fire
2 attacks - Ranged 10; +9 vs. Reflex; 2d4 + 6 fire damage.
Secret of Earth (standard; at-will) ✦ Thunder
Close burst 1; +9 vs. Fortitude; 1d6 + 6 thunder damage, and the target is pushed 3 squares.
Secret of Shadow (standard; recharge 4 5 6) ✦ Shadow
The Faceless One makes a separate attack against 5 different targets; range 10; +9 vs. Reflex; 1d8 + 6 necrotic damage and target slowed (save ends).
Secret of the Grave (standard; recharge 5 6) ✦Fear, Necrotic
Area burst 1 with range 10; +9 vs Will; 1d8+6 necrotic damage, and targets are immobolized (save ends)
Steal Face (immediate) ✦ Illusion
Whenever the Faceless One is missed with a melee attack, he can immediately transform his look to look like that of the person who attacked him. Further melee and ranged attacks have a 50% chance of hitting the Faceless One's foe, as long as they remain adjacent and the Faceless One continues to look like them. This guise drops when the target is no longer adjacent to the Faceless One.
Alignment Evil Languages Common
Skills Arcana +11, Bluff +8
Str 10 (+2) Dex 14 (+4) Wis 17 (+5)
Con 12 (+3) Int 18 (+6) Cha 12 (+3)
Equipment robes, quarterstaff , wand
Everything in the room depended on how the PC's did the skill challenge. Luckily, they beat it, and so there were only human cultists, and not wererats.