Cranial Bore

This spell animates and propels the automaton at a creature within range, the target must have a discernable head. The target must make a Dex save to avoid. If the Cranial Bore hits the target, it rapidly begins drilling into the target's skull inflicting 3d10 piercing damage at the end of the casters turns. The target may use an action to attempt to remove the Cranial Bore with a strength check versus the spell DC.

If the Cranial Bore kills the target, it fully enters the targets skull and takes control of its corpse.

The corpse has an AC of 10 and 30 hitpoints, it acts at the end of the casters turns, it cannot use any of the creatures' feats, multiattacks or abilities but is otherwise under the casters control. It may perform actions normally and can control a corpse for 10 minutes before the Cranial Bore leaves the corpse and deactivates. 

The Cranial Bore can damage any creature that has a head, but it can only control a corpse of size category large or smaller.

If the Cranial Bore fails to hit with its initial attack it returns to the caster.