Omniscient Whispers

Prerequisite(s): Exposure to commune or contact other plane spell.
Benefit: A constant, barely audible muttering echoes in your ears, usually beyond your comprehension. But if you focus all your energy on listening, you sometimes catch a sentence or two that bears directly on your current situation. Once per week, you can tune into the voices you hear, getting the answer to a question much as if you had asked it with a commune spell. Using this feat renders you exhausted.
Source: Unearthed Arcana