Arcane mastery
( Complete Arcane, p. 73)[General]
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 spelllike abilities (including invocations),
Benefit
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.