Bitterblot Paste
They can ask up to 3 questions and receive brief answers (usually just 2-3 words) in reply. If the result is odd, the player rolls 1d6. On a result of 1 to 4 the character gains a form of long-term madness for 1d10 x 10 hours. On a result of 5 to 6, they gain a form of indefinite madness.