Damp Power (psionic):
Manifesting Time: 1 immediate action
An amber aura quickly spreads over your body, moderating the effects of the environment. When you manifest this power, you are protected from the vagaries of destructive energies directed against you. All variable numeric effects of the next power, psi-like ability, spell, or spell-like ability that affects you before the end of your next turn is decreased to its minimum possible value. For instance, if you are struck by an energy ray augmented to deal 5d6 points of damage while protected by damp power, you would take only 5 points of damage.
Can I use an Immediate Action right after attack/damage roll?