Shadow Trickster

 
Prerequisite(s): Caster level 1+, one Shadow Hand strike.
 
Benefit: While you are in a Shadow Hand stance, the save DC for any illusion spell you cast increases by 2. You also gain a +2 bonus on damage rolls when making a sneak attack, a sudden strike (see the ninja class description, page 8 of Complete Adventurer), or when you flank your target.
 
Source: Tome of Battle: The Book of Nine Swords