Corrosive Experiment

Blind. Due to the liquid it was suspended in, it was unable to form eyes as the organic material that was supposed to comprise its eyes could not hold up to the acidic nature of the liquid. 

Coming Apart at the Seams. Some parts of the experiment are slightly apart at the seams, causing its caustic blood to pour from it. Creatures grappling it will take 5 (1d10) acid damage per round. This also causes acid to leave a puddle in its space if it stays stationary for two rounds.

Additionally, its blood is flammable, making the experiment vulnerable to fire damage as it is almost always coated in this liquid.

Immutable Form. The experiment is immune to spells that would alter its form.

Multiattack. The experiment makes two slam attacks. Alternatively, it can Puke.

Slam. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage. 

Puke (Recharge 4-6). The experiment can choose to puke out some of the excess acidic substance in its system, leaving a 5ft. radius puddle of the substance in front of it. Any creature that ends its turn in the puddle of acid takes 5 (1d10) acid damage. The puddle of acid will stay acidic for 1 minute before exposure to the air neutralizes the acid, making it harmless.

Caustic Blood. Due to the nature of its creation, the blood that keeps this being alive has been affected by the liquid it was suspended in, turning its blood into a caustic acid-type substance. When it is struck with slashing or piercing damage causing its blood to spray, the attacker suffers 5 (1d10) acid damage per strike.