Void Mass

The ink that you use for the spell gathers and expands, filling a 10ft. space rapidly which echoes the chilling and lifeless properties of the void. The mass is gathered at a point you choose and for the duration of the spell the area becomes magical darkness, any creature with darkvision cannot see through the sphere's darkness and non-magical light cannot penetrate it either. No sound can be created within or pass through the sphere, as such, creatures who are wholly within the sphere are immune to thunder damage and being deafened. Casting spells within the sphere that require somatic elements automatically fail.

Creatures who are entirely within the sphere are unable to breathe. A creature who is entirely within the sphere and attempts to remove themselves must succeed a Strength saving throw in order to free themselves, failing to do so will cause them to take 5d6 necrotic damage. For every three failed attempts a creature makes to free themselves incurs a point of exhaustion.

At Higher Levels. When you cast this spell using a 6th level slot or higher, the damage received for failing to escape the sphere increases by 1d6.