Wyste

Huge aberration, unaligned

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• Armor Class 13 (natural armor)
• Hit Points 168 (16d12 + 64)
• Speed 20 ft., swim 40 ft.

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STR	DEX	CON	INT	WIS	CHA
19 (+4)	13 (+1)	18 (+4)	1 (-5)	11 (+0)	8 (-1)

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• Damage Immunities acid
• Senses blindsight 120 ft. (blind beyond this radius), passive Perception 10
• Languages —
• Challenge 5 (1,800 XP)

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Amphibious. The wyste can breathe air and water.

Mucous Aura. The ground and water within 10 feet of the wyste is slimy difficult terrain for creatures other than aberrations.

Actions

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) piercing damage, and if the target is Medium or smaller, the target is also grappled (escape DC 15) and restrained until this grapple ends. While it has a target grappled, the wyste can't use its bite against another target.

Swallow. The wyste makes one bite attack against a target it has grappled. If the attack hits, the target is also swallowed. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the wyste, and it takes 14 (4d6) acid damage at the start of each of the wyste’s turns.
A wyste can have only one target swallowed at a time.

If the wyste takes 20 damage or more on a single turn from a swallowed creature, the wyste must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 feet of the wyste. If the wyste dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 feet of movement, exiting prone.