You deal more damage with your powers.
Prerequisites
Weapon Focus (ray), manifester level 4th.
Benefit
With rays and ranged touch attack powers that deal damage, you deal one extra die of damage. So, if the power normally deals 3d6 damage, it instead deals 4d6 damage.
If you expend your psionic focus when you manifest a ray or a ranged touch attack power that deals damage, you also add your key ability bonus to the damage it deals.