Cosmo

Regeneration. Cosmo regains 50 hit points at the start of its turn. If it takes thunder damage, this trait doesn't function at the start of its next turn. Cosmo dies only if it starts its turn with 0 hit points and doesn't regenerate.

Ventriloquism. Whenever Cosmo speaks, he can choose a point within 60 feet; its voice emanates from that point.

Multiattack. Cosmo makes two Mental attacks and uses his Frightful Word once.

Mental Sword. : Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 8 (3d8 + 4) slashing damage plus 20 (5d10) physic damage.

Frightful Word. : Cosmo targets one creature it can see within 15 feet of him. The target must succeed on a DC: 23 Wisdom saving throw or become frightened for 1 minute. While frightened in this way, the target must take the Dash action and move away from Cosmo by the safest available route on each of its turns, unless there is nowhere to move, in which case it needn't take the Dash action. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Teleport.  Cosmo magically teleports, along with any equipment it is wearing and carrying, up to 120 feet to an unoccupied space it can see.

Twisting Words. Cosmo targets one creature it can see within 60 feet of it. The target must make a DC: 23 Charisma saving throw. On a failure the target is charmed for 1 minute. The charmed target can repeat the saving throw if Cosmo deals any damage to it. A creature that succeeds on the saving throw is immune to Cosmo's Twisting Words for 1 hours.