Beheaded

Beholder Fusion. If the beholder that created this beheaded is within 10 feet of it, the beheaded can use an action to pick up the beholder and put it on its shoulders. If it does, the beholder becomes fused onto the shoulders of the beheaded and their minds become one. For its ability scores, it keeps the Strength, Dexterity, and Constitution of the beheaded and gains the Intelligence, Wisdom, and Charisma of the beholder. It gains the actions, legendary action, senses, languages, and other proficiencies of the beholder, as well as its Antimagic Cone ability. It also has the beholder's lair.

Multiattack. The beheaded makes three claw attacks and a tentacle attack.

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 17 (3d8 + 4) slashing damage.

Tentacle. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage and the target must make a DC 18 Strength saving throw or take an additional 9 (2d8) of either cold, fire, acid, or necrotic damage, randomly determined. A creature who fails the save is also grappled in one of the beheaded's two tentacles, each of which can only grapple one creature at a time.

The beheaded can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The beheaded regains spent legendary actions at the start of its turn.

Claw. The beheaded makes a claw attack.

Tentacle (Costs 2 Actions). The beheaded makes a tentacle attack.