Tirer La Couverture ("pull the curtain back") was a ritual created in 16th century by French sorcerer Cloutier. It caused notable anguish to demons, as it enabled the caster to enter a trance wherein he or she could perceive the trace signature of spells cast nearby. Buffy Summers performed the ritual in her house, leading her to discover that her sister Dawn was actually the result of a spell. When the Seed of Wonder was restored and the new rules governing magic started appearing in the Slayer Handbook, Willow Rosenberg offered to cast a Tirer La Converture to run a trace.