You are quick and certain in your efforts to defeat the arcane defenses and spells of others.
Prerequisite: Ability to cast arcane spells or use spell-like abilities (including invocations).
Benefits: You can take 10 on caster level checks (as if the caster level check was a skill check). You can use this feat even while under stress.
Source: Complete Arcane, page 73. Corrected for errata.