Tryptophan Signet

Acquisition
Skill quests:
 * Forbidden Fruit (Captain Langmar in Grothmar Wardowns)

Trivia

 * The title references the drowsiness-inducing effect of the amino acid tryptophan.
 * This skill and Lightbringer Signet are the only two signets in the game that do not have flat, engraved icons similar to the front of a signet ring.