Black Star

to cast you need (A shard of obsidian and a drop of your own blood, both of which are consumed). 

Dark Star creates a 40-foot radius sphere of magical darkness and intense gravity, lasting 1 minute with concentration. It deals 8d10 force damage on a failed Con save (150-foot range) and creates difficult terrain.

Creatures entering or starting their turn in the area take 8𝑑10 force damage (Constitution save for half). 

The sphere is filled with magical darkness that even darkvision cannot see through. No sound can pass through the area; creatures inside are deafened and immune to thunder damage. Because of the absolute silence, casting spells with verbal components is impossible while inside the sphere.