Type: General
Source: Player's Handbook II
Your arcane studies have brought forth your nascent talent to sense magical auras and the power that others are capable of wielding.
Prerequisite: Arcane caster level 9th.
Benefit: You can use detect magic at will. Also, as a swift action, you can attempt to determine an opponent's spellcasting ability. You make a Sense Motive check (DC 5 + target's caster level). If this check succeeds, you learn the highest-level spells the target is capable of casting. This benefit grants you no insight into spell-like or supernatural abilities.