Chain-Sibriex, the Fleshbound Tyrant

Aura of Twisted Flesh.
Creatures that start their turn within 30 feet of the Chain-Sibriex must succeed on a DC 18 Constitution saving throw or suffer one of the following effects (Chain-Sibriex’s choice):

• Speed reduced by half until the end of their next turn.

• Disadvantage on attack rolls until the end of their next turn.

• Take 14 (4d6) necrotic damage.

Living Chains.
The Chain-Sibriex is surrounded by animated, barbed chains. These chains can occupy other creatures’ spaces and can pass through solid objects as if they were difficult terrain.

Magic Resistance.
The Chain-Sibriex has advantage on saving throws against spells and other magical effects.

Regeneration.
The Chain-Sibriex regains 20 hit points at the start of its turn. If it takes radiant damage, this trait doesn’t function until the start of its next turn.

Multiattack.
The Chain-Sibriex makes three attacks: two with Chain Lash and one with Warping Gaze.

Chain Lash. Melee Weapon Attack: +12 to hit, reach 30 ft., one target.
Hit: 15 (2d8 + 6) slashing damage plus 10 (3d6) necrotic damage, and the target is grappled (escape DC 18). While grappled, the target is restrained.

Warping Gaze.
One creature the Chain-Sibriex can see within 60 feet must make a DC 18 Constitution saving throw. On a failure, the creature takes 36 (8d8) necrotic damage and suffers a flesh warp:

• Disadvantage on Strength, Dexterity, or Constitution checks (Chain-Sibriex’s choice) for 1 minute.
  On a success, the creature takes half damage and suffers no additional effect.

Chain Rend (Recharge 5–6).
All creatures restrained by the Chain-Sibriex take 45 (10d8) slashing damage. Each creature must then succeed on a DC 18 Constitution saving throw or gain one level of exhaustion.

Reel the Weak.
The Chain-Sibriex pulls one restrained creature up to 20 feet toward it and makes one Chain Lash attack against that creature.

Sadistic Retort.
When a creature within 30 feet deals damage to the Chain-Sibriex, that creature must succeed on a DC 18 Wisdom saving throw or take 14 (4d6) psychic damage and be frightened until the end of its next turn.

The Chain-Sibriex can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time.

Chain Strike. Makes one Chain Lash attack.
Warp Flesh (Costs 2 Actions). One creature within 30 feet must succeed on a DC 18 Constitution saving throw or be poisoned until the end of its next turn and take 18 (4d8) necrotic damage.
Unholy Command (Costs 3 Actions). All restrained creatures must immediately use their reaction to make one weapon attack against a target of the Chain-Sibriex’s choice.

Mythic Action Name. Enter the description for how mythic actions work for your monster here.

Mythic Action Name (Costs # Actions). Enter the description for your mythic action.