Touch of the Void

You open a small, spherical gateway in the space of a creature within range. Make a ranged spell attack against the creature to suck its vitality into the lightless void between the stars. On a hit, the target takes 1d8 necrotic damage, and it can't regain hit points until the start of your next turn. Until then, the void sphere orbits the target, leaching its lifeforce.

If a creature is reduced below 0 hit points by this attack, it immediately fails its first death saving throw.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).