You gain hideous insights into subjects not meant to be understood by mortal minds.
Prerequisites: Bardic knowledge or lore, mild depravity.
Benefit: When you make a bardic knowledge or lore check, you add a bonus to the check if the question touches on supernatural, horrific, tainted, or otherwise forbidden subjects (at the DM’s discretion). Add a +2 bonus if you are mildly tainted, a +4 bonus if you are moderately tainted, and a +6 bonus if you are severely tainted.
Source: Heroes of Horror, page 123.