When you know what you're dealing with, it is easy to discern your opponents' weaknesses.
Prerequisite: Monster lore class feature.
Benefit: If you have already successfully identified a monster with the appropriate Knowledge skill check, you may make a Perception skill check to determine an additional weakness of that monster as a move action. The DC for this check is the same as that of the Knowledge check. If you succeed, you automatically learn one more of the monster's weaknesses, regardless of your original Knowledge skill check result. You may only benefit from this feat once per monster.