Blood Sludge

You Are What You Eat. The Blood Sludge can utilize any armor consumed by it to its advantage, if a Blood Sludge consumes a piece of light armor, it gets a +1 to its AC. If it consumes a piece of Medium Armor, +2. Likewise, a piece of heavy armor, +3. If it consumes a piece of magical armor, there is a 55% chance it will gain the armor's effects.

Carrier of Plague. The Blood Sludge has an innate sickness that it carries, and can pass it on to other creatures. If a creature is infected, it loses 1 HP every hour, and after 3 hours of being infected, is deafened, after 5 hours of being infected, suffers 3 levels of exhaustion, and after 1 hour of being infected, must consume twice as much food and drink per day. After 7 hours of infection, is blinded, suffers 4 levels of exhaustion, is frightened, is unable to sleep, and dies when HP reaches zero. 

Shapeless. The Blood Sludge can fit into any crack or hole leaving behind all its items in their body that are too big for the hole.

Shapely Form. The Blood Sludge can take form to any shape from monstrous to humanoid to plain shapeless forms.  The Blood Sludge can wear any form of armor made in their size.

Hard to put down.  Some Blood Sludges have figured out they can extend their life by separating a piece of their body  and hiding it miles away or near by and if their original form dies their tiny piece will start to form a new body.

Ooze Nature. A blood Sludge doesn’t require sleep.

Spider Climb. The Sludge can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Forceful Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 1d6+1 bludgeoning damage. The Blood Sludge slams its prey against a wall.

Corroding Spit. Ranged Weapon Attack: +6 to hit, range 5/30 ft., 1 target. Hit: 1d10 necrotic damage. The Blood Sludge spits a deadly necrotic part of their body.

Multi-Attack. The Blood Slime can attack twice in a row

Natural Grappler. Melee Weapon Attack: +6 to hit, reach 5 ft,  The Sludge make a grapple attack at advantage. Each round the victim is grappled the victim takes 1d10 damage.

Deathly Breath (3/Day). As a reaction, the Blood Sludge can release a sort of breath that emanates from its body. This is a red, smoke-like substance, and any creatures within 20 feet must make a DC 15 Saving Throw or suffers one level of exhaustion.

Blood Heal. The slime heals 1d10 for each ounce of blood drank from a victim or corpse for each round it is grappled to a person.