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Epic Invoking (3.5e Feat)
From D&D Wiki
Epic Invoking [Epic]
Prerequisite: Maximum number of invocations in any class that uses them.
Benefit: Gain 1 invocation from your class of the highest category ("Dark" for most classes), an invocation of lower category from any other class, or 2 invocations of lower category from your class.
Special: You may gain this feat multiple times.