A memory purge spell caused the target to mystically forget all recent negative feelings, memories, or occurrences. Willow first cast this spell to erase all memory of an argument concerning her growing misuse of magic from Tara's mind, though Tara eventually discovered Willow's betrayal. Later, after promising to go a week without using magic, Willow immediately went back on her word and cast this spell again, intending to erase all negative aspects of the spells she cast on Buffy and Tara from their minds, though she also managed to induce a delayed effect, so it would not be cast until she wanted it to. However, in her rush to get to the Magic Box, Willow unwittingly left an entire bag of the Lethe's Bramble by the fireplace, which ignited and, instead of causing Willow's intents, gave