A 30-foot-radius of shadowy void surrounds you, pulling all energy inside of it towards you. This sphere of shade tears apart the very fabric of the multiverse, draining the magical essence of sentient creatures to augment your own, and creating a sphere of magical darkness. A creature with darkvision can't see through this darkness, and light can't illuminate it. Each creature that starts their turn inside the sphere takes 6d6 necrotic damage, and you regain hit points equal to the necrotic damage dealt.

Targeted Effects. Spells and other magical effects , such as magic missile and fire bolt, that target a creature or an object in the sphere and deal fire, cold, radiant, force or necrotic damage have no effect on that target, and you regain a spell slot of a level equal to the level of the spell cast. 

Areas of Magic. The area of another spell or magical effect, such as fireball, can't extend into the sphere. If the sphere overlaps an area of magic, the part of the area that is covered by the sphere is suppressed. For example, the flames created by a wall of fire are suppressed within the sphere, creating a gap in the wall if the overlap is large enough. 

Magical Travel. Teleportation and planar travel fail to work in the sphere, whether the sphere is the destination or the departure point for such magical travel. A portal to another location, world, or plane of existence, as well as an opening to an extradimensional space such as that created by the rope trick spell, temporarily closes while in the sphere.

Dispel Magic. Spells and magical effects such as dispel magic and antimagic field have no effect on the sphere.