Amriel

Telepathic Bond. Amriel ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.

Shapechanger. Amriel can use its action to polymorph into a Small or Medium humanoid, back into its true form or anything in between. Without wings, Amriel loses its flying speed. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Charm. One humanoid Amriel touches must succeed on a DC 17 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys Amriel's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to Amriel's Charm for the next 24 hours.

Draining Kiss. Amriel kisses a creature. The target must make a DC 15 Constitution saving throw against this magic, taking 32 (5d10 + 5) psychic damage and Amriel regains 2 (1d4) hp on a failed save, or half as much damage on a successful one, Amriel isn’t healed for any hp.

Etherealness. Amriel magically enters the Ethereal Plane from the Material Plane, or vice versa.

Demonic Message. Amriel attacks one creature in range of telepathy. The target must make a DC 10 Wisdom saving throw, taking 12 (2d8+4) psychic damage on a failed save, or 6 (1d12) psychic damage on a succesful one.