Unearthly Shambler

Polymorphic Stability. The Unearthly Shambler has advantage on saving throws made to prevent it from changing its shape.

Multiattack. The Unearthly Shambler makes two tendril attacks and one polyp attack.

Tendril. Melee Weapon Attack. +8 to hit. Reach 10 ft., one target. Hit: 2d6 + 5 piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw. On a failure, the creature is grappled and pulled 10 ft toward the Unearthly Shambler.

Bite. Melee Weapon Attack. +8 to hit. One target. Hit: 3d8 + 5 piercing damage.

Polyp. Ranged Weapon Attack. +5 to hit. One target. Range 40ft.  Hit: 1d6 + 2 piercing damage, 1d6 poison damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw. On a failure, the creature is poisoned for 1 minute.

The Unearthly Shambler 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 Unearthly Shambler regains spent legendary actions at the start of its turn.

Tendril The Unearthly Shambler makes a tendril attack.

Polyp The Unearthly Shambler makes a polyp attack.

Bite The Unearthly Shambler makes a bite attack on a creature it has grappled.