Du'ulora Ancestor( Player's Guide to Eberron, p. 83)
The tsucora are the most common of the quori, but they are not the only spirits in Dal Quor. You are descended from a du'ulora quori--a spirit that feeds on human anger and rage. By drawing on your du'ulora essence, you can enter a state of focused fury.
CON 13, 1st level only, Kalashtar,
If you have the rage class feature, you can expend your psionic focus when you enter a rage to extend the duration by 5 rounds. If you are a multiclass character, your barbarian class level does not count when determining whether you take an XP penalty.