The Magic Bone held by Warren, moments before using it in a Time Loop Spell.

Stop touching my magic bone!
―Jonathan Levinson[src]

The Magic Bone was an artifact used as a component in spells. It had the appearance of a long bone of an unspecified creature. Several runes and sigils were written over the bone. It was used by Jonathan Levinson in a spell to trap Buffy Summers in a time loop. Warren Mears also suggested it could be used in a Demonic Disguise Spell.