A 4 eyed, dark black mass, with a ferocious jaw looking eldritch, it will toy with you, mess with you, it wants to eat your bones and leave you limp. It will hunt its prey for years on end, only ever revealing itself once the clock strikes midnight. It is a predator.

It stalks it's prey, monitoring it, before starting to mess with it mentally, making it it's plaything before eventually it get's tired of you and hunts you dead.
Occasionally it mimics friends / family's voices to mess with you.