Demonglass Orb
Orb, Rare (Requires Attunement)

Red and black flames flicker behind the rough cut facets of this heavy demonglass shard. Memories of the Ages of Demons are bound within, and spellcasters who dare channel their magic through it find themselves and their targets visited by visions of that terrible past.

Whenever you cast a Divination spell using this Orb as a Spellcasting Focus, you can give up some of your life force to reduce the saving throw of one creature affected by your spell. Roll 1 to 4 d6s; the resulting total is how much Necrotic damage you take. This damage can't be reduced in any way. The target has its saving throw reduced by 1 for each d6 of damage you take. You must decide how many dice to roll before the DM says whether the target succeeds or fails.