Ethereal Glutton

Beings from the Winding Abyss, which drift into Arcadia looking to gorge themselves on the dreams of weak-willed mortals.

_{Large aberration , neutral evil}

STR	DEX	CON	INT	WIS	CHA
Armor Class 17 (natural armor)
Hit Points 135(18d10 + 36)
Speed 0 ft., fly 30 ft. (hover)
21 (+5)	9 (-1)	15 (+2)	10 (0)	14 (+2)	18 (+4)
Saving Throws WIS +6, CHA +8
Skills Deception +8, Perception +6, Performance + 8
Senses passive Perception 16
Languages Telepathy 120 ft.
Challenge 10 (5900 XP)

Writhing Underbelly. Any enemy creature which starts it’s turn within 5 feet of the Ethereal Glutton must make a DC 14 strength saving throw. On a failure, that creature receives 12 (2d6 + 5) bludgeoning damage.
Dreaming Wonderland. The Glutton hosts a pocket space on the Ethereal Plane. It uses this space to construct the dream world which houses creatures it has magically put to sleep with Sleep prison. The Dreaming Wonderland exists around the Ethereal Glutton’s primary target; The first creature it has imprisoned this way. If the primary target of the Dreaming Wonderland is woken up, all creatures trapped in this space also wake up, And the Glutton must select a new Primary Target. The Ethereal Glutton controls the details of this world, and can present it in convincing detail. The Primary Target is entirely convinced by this false world, but additional creatures may make a DC14 insight check to determine that they are trapped in a dream.

ACTIONS

Multiattack. The Glutton makes two tentacle attacks.
Etherealness. The Glutton magically enters the Ethereal Plane from The Material Plane via the dreams of a sleeping creature, or vice versa. To do so, the Glutton must be within 5 feet of a sleeping creature. If that creature is awoken, the Glutton is ejected back into the physical world.
Tentacle. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) bludgeoning damage.
Sleep Prison (1/Day). The Dream Glutton plays haunting music within a range of 50 feet. All creatures who can hear this music must succeed on a DC 14 Wisdom saving throw or be magically put to sleep by the Dream Glutton. Creatures put to sleep this way can only be woken up with the Remove Curse spell, if the Dreaming Wonderland is broken, if the Ethereal Glutton releases them or if the Ethereal Glutton dies.

LEGENDARY ACTIONS

Legendary Actions The Ethereal Glutton 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 Ethereal Glutton regains spent legendary actions at the start of its turn.
Lethargic Gaze. Target creature must succeed on a DC14 Wisdom saving throw. On a failure, the target creature falls unconscious until the sleeper takes damage, or someone uses an action to shake or slap the sleeper awake.
Dream Eating (Costs 2 Actions). One creature put to sleep by the Glutton takes 10 (3d6) psychic damage, and the Glutton regains hit points equal to the damage