The Doom's Gate Chronicles
The thief relies on subtlety and trickery, preferring to use cunning to overcome his foes rather than brute force.
1) Backstab – A thief may backstab an enemy for x4 damage as long as he is not directly in combat. If the thief’s target is not in combat, the thief must make a successful Move Silently roll before he can make a backstab attempt.
2) Evade – A thief may attempt to duck out of combat with a successful Hide in Shadows roll as long as he is not alone in melee combat against an opponent.