Orb Of Light
Quote:
An orb of pure light the size of your hand shoots from your fingertips at a target. If you succeed on a ranged touch attack, the orb causes 1d6 hp damage per caster level (maximum 15d6). Undead suffer 1d8 hp damage per caster level (maximum 15d8). A creature struck by the orb is also blinded for 1 round. A successful Fortitude save prevents the blinding effect but not the damage.
This is pretty easy to understand, but my question is. Does the DM need to tell us if its undead or not when we use this spell, or should we roll both versions of damage everytime if the answer is unknown to the party?