Adrenochrome

Hunter S. Thompson's fictional drug (based on a genuine chemical without any such properties), game-ified. Please do not murder people for their adrenal glands, this is all made-up silliness.

Adrenochrome
Chance of Addiction: 10% per use, cumulative
Cost: 50 gp

This fluid is extracted from the fresh adrenal glands of a human being.  Extraction is typically fatal for the donor, but such is the price of pleasure.

Effects:
Increased strength (+1d3 STR) for 24 hours
Hallucination (if in combat, consumer may be treated as under the effects of a confusion spell) for 24 hours
50% chance of euphoria (+2 morale), 50% fear (-4 morale) for 24 hours

Addiction:  There are no visible signs of adrenochrome addiction - the addict appears to be a normal person.  Until they strike.

Withdrawal:  Adrenochrome addiction is permanent.  Each day that the user goes without adrenochrome, he has a 5% cumulative chance of snapping and cutting off the nearest person’s head to get at their adrenal gland.  He will, in desperation, even try cutting off a demi-human or humanoid head - but the adrenochrome from such sources is of poor quality, and will not satisfy the addict’s cravings.