Dark Soulbind

This spell captures a soul from the dead and binds it to a statue. The soul will protect a place or person designated, attacking any creature it senses as a threat to its charge.

The Dark Soul cannot move more than 30ft away from its bound statue. 

Dark Souls use the Soul Drain attack action.

Soul Drain: 10' Radius around the Dark Soul. 5 (1d4+3) psychic damage. The target loses maximum hitpoints equal to half the damage taken, rounded down, and the Dark Soul regains this amount of hitpoints. Charisma save DC 12 prevents the Soul Drain.