Path of Shadows( Races of Eberron, p. 110)
You can use dancelike maneuvers to aid your defense.
Perform (dance) 5 ranks, Kalashtar,
Dancing with Shadows (RoE) ,
You gain a +2 bonus on Tumble checks, and you can make a Perform (dance) check in place of a Concentration check to cast a spell or manifest a psionic power defensively.