Large to Huge ooze,

Armor Class: 13 (natural armour)

Hit Points: 310hp (27d10+6)

Speed: 30 ft

STR

18 +4

DEX

10 +0

CON

22 +6

INT

5 -3

WIS

12 +1

CHA

8 -1

Saving Throws: +10 CON

Damage Vulnerabilities: Cold, Acid

Damage Resistances: Bludgeoning, Slashing, Piercing, Force,

Damage Immunities: Necrotic, Poison

Condition Immunities: Grappled, Frightened, Blinded

Senses: Blindsight. 60ft. (blind beyond this radius)

Languages: None.

Challenge Rating: 7

Proficiency Bonus: +4

Actions

Stray Arm. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 8 (1d6 + 4) bludgeoning damage. If the d6 results in a 1, deal 4 damage to this creature and spawn 1 Crawling Claw. If the d6 results in a 6, the target must succeed a DC 14 STR saving throw or be grappled.   Grasping Wave. Melee Weapon Attack: The corpse mould moves 15ft in a straight line in any cardian direction. All creatures this monster passes over or stops on must make a DC 15 STR or DEX saving throw. On a success, the target takes (current hp/20, rounded up) crush (bludgeoning) damage. On a failed saving throw, the target takes (current hp/10) crush damage, and the target(s) are knocked prone. A creature grappled by the Corpse Mould automatically fails this roll, and it moved with the Corpse Mould, and must make a DC 15 CON saving throw. On a failed save, the grappled creature ingests part of the Corpse Mould, and is infected with Half-Dead Humours. Half-Dead Humours: this creature cannot expend hit dice until Half-Dead Humours ends or is removed. Each day this creature loses 1 speed perminantly until the Half-Dead Humours ends or is removed; whenever this creature takes a long or short rest, it loses 1 max hp perminantly. Each day, this creature can attempt to end this effect by succeeding on a CON saving throw with the DC equal to the creatures max hp, to a maximum of 21. Half-Dead Humours can be removed by a Protection from Poison, or Remove Curse spell.