Skull of Necrosis

Usable as a spellcasting focus - requires attunement

Skull spellcasting focus. Made of a black stone, missing a tooth where the purple crystal was embedded

+1 to all spell attack rolls and save DC +1d6 to all necrotic damage done using this bonus to school of necromancy spells - increases spell slot level by 1 without expending a slot once per day