Dark Beacon

You summon a shadowy beast, a creature made of pure darkness. It takes the form of a shadowy predator (choose a stat block like a Dire Wolf, but with resistance to non-magical attacks and darkvision). The creature is loyal to you for the duration of the spell, but you must maintain concentration or it may turn against you. If you lose concentration, the beast will act on its own, with a 50% chance of turning hostile.