Ashen Shambling Mound

Whenever the shambling mound is subjected to Lightning damage, it takes no damage and regains a number of hit points equal to the Lightning damage dealt.

When the shambling mound drops to 0 hit points, it is reduced to a pile of ash, and any equipment it was wearing or carrying falls to the ground.

The shambling mound makes two slam attacks. If both attacks hit a Medium or smaller target, the target is Grappled (escape DC 14), and the shambling mound uses its Engulf on it.

Melee Weapon Attack +7 to hit, reach 5 ft., one target. 13 (2d8 + 4) Bludgeoning damage.

The shambling mound engulfs a Medium or smaller creature Grappled by it. The engulfed target is Blinded, Restrained, and unable to breathe, and it must succeed on a DC 14 Constitution saving throw at the start of each of the mound's turns or take 13 (2d8 + 4) Bludgeoning damage. If the mound moves, the engulfed target moves with it. The mound can have only one creature engulfed at a time.