Adhesive. The corpse monstrosity causes Medium or smaller objects to adhere to it. A Medium or smaller creature that touches the corpse monstrosity is grappled by it (escape DC 13).
Armor of Bones. If the corpse monstrosity takes 10 or more bludgeoning damage on a single attack, it must make a DC 13 Constitution saving throw or have a part of its protective armor broken off. Until it takes a long rest or resorbs enough corpses, its AC decreases by 2.
Death Scream. When the corpse monstrosity dies, it emits a blood-curdling shriek that can be heard out to a range of 120 feet. This shriek causes nonmagical, organic material within 15 feet of the corpse monstrosity to rot. Each creature within 15 feet of the corpse monstrosity when it dies takes 21 (6d6) necrotic damage.
Resorption. If the corpse monstrosity moves into a space occupied by a Large or smaller creature that has been dead for no longer than 1 minute, it is broken down and added to the corpse monstrosity. After it resorbs a creature, the corpse monstrosity regains 17 (2d10 + 6) hit points and its AC goes up by 3 for the next minute.
Spider Climb. The corpse monstrosity can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Unusual Nature. The corpse monstrosity doesn't require air, food, drink, or sleep.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) piercing damage and 5 (2d4) acid damage. The target must succeed on a DC 13 Constitution saving throw or be poisoned for 1 minute. If this damage reduces the target to 0 it makes death saves with disadvantage.
Bone Breath (Recharge 6). The corpse monstrosity exhales pieces of bone covered in acid in a 15-foot cone. Each creature in that cone must make a DC 13 Dexterity saving throw, taking 10 (3d6) piercing damage and 10 (3d6) acid damage on a failed save, or half as much damage on a successful one.
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