- "This is a tail from a cranium rat."
- Can be turned in to Phineas at the Office of Vermin and Disease Control for 1 copper a piece. Unlocks another quest.
- Can be used as a key to a portal in the Trash Warrens to enter a secret room full of Cranium Rats and good loot.
- 6 of them can be traded with the Knifed Ghoul in exchange for Uhir's knife.
Once there are no other uses for them, the tails can be sold to merchants for a better price than the one set by the Office of Vermin and Disease Control (7 or 8 coppers instead of 1).
Cranium Rat Tails can be acquired: