Bahzuuhl the Decaying

Legendary Resistance (3/Day). If Bahzuuhl fails a saving throw, it can choose to succeed instead.

Magic Resistance. Bahzuuhl has Advantage on saving throws against spells and other magical effects.

Siege Monster. Bahzuuhl deals double damage to objects and structures.

Decay and Digest. Any creature restrained within Bahzuuhl's body at the start of its turn must make a DC 25 Constitution saving throw. A creature takes 18 (5d6) Acid damage and 18 (5d6) Necrotic damage on a failed save or half as much on a successful one.

Multiattack. Bahzuuhl makes one Bite attack, two slams attacks and one Catapult Flesh attack if it is available.

Bite. Melee Attack Roll: +19, reach 15 ft. Hit: 23 (2d12 + 10) Piercing damage plus 22 (4d10) Necrotic damage, and the target has the Grappled condition (escape DC 20). Until the grapple ends, the target has the Restrained condition.

Slam. Melee Attack Roll: +19, reach 20 ft. Hit: 28 (4d8 + 10) Bludgeoning damage.

Flesh Catapult (Recharges 5-6, Costs 50 HP). Ranged Attack Roll: +19, range 240 ft/1 mile, one target. Hit: 75 (10d12 + 10) Bludgeoning damage. A Huge flesh mass occupies an area centered on the target on a hit and targets smaller than it are Grappled and Restrained (escape DC 20). On a miss, or if the target the same size or larger, the flesh mass lands in the closest unoccupied space large enough for it to fit. The flesh mass has 50 HP, 15 AC and is stationary unless commanded via Reclaim Flesh. Creatures restrained by the flesh take 11 (2d10) Necrotic damage at the start of their turn, and the flesh mass gains that many Hit Points and Max Health.

Reclaim Flesh. Bahzuuhl calls all separated masses of flesh within 120 ft. to return to its body. Each mass moves 60 ft. towards Bahzuuhl via the most direct path, pushing creatures and objects out of the way, and merges with it if it enters any space occupied by Bahzuuhl. Creatures and objects already trapped within the flesh move with the flesh and are restrained within Bahzuuhl if they reach its body.

For each mass of flesh that is Huge or larger, Bahzuuhl regains Hit Points equal to the current HP of each flesh mass. The amount of health regained cannot be reduced or prevented by any means except by the Wish spell, magical effects of similar power, or Divine Intervention.