Actions

Pseudopod. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 10 (1d12+4) 1d12+4 bludgeoning damage plus 18 (4d8) 4d8 acid damage. On an attack roll of 19 or 20, armor worn by the target is partly dissolved and drops a quality level, as if being hit by a critical hit. Unless it is magical, the armor is destroyed if it drops below Ruined.

Bonus Actions

Dissolve. While in contact with his dredge and as an action, Goyslop may dissappear within the dredge and reappear at a point of his chosing, so long that he remains in contact with the dredge.

Reactions

Split. When a Goyslop that is medium or larger is subjected to lightning or slashing damage, it splits into two new Goyslops if it has atleast 10 hit points. Each new Goyslop has hit points equal to half the original Goyslop's, rounded down. New Goyslops are one size smaller than the original Goyslop.

Legendary Actions

While gargantuan, Goyslop can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Goyslop regains spent legendary actions at the start of its turn.   Pseudopod Attack. Goyslop makes a pseudopod attack.   Dissolve (Costs 2 Actions). Goyslop uses the dissolve bonus action.   Summon Mini-slop (Costs 2 Actions). Goyslop spits out a mini-slop at a point of his choosing within 30 feet of him.

Lair Actions

Dredge. The water within Goyslop's lair is filled with dregde. Each creature that starts its turn in the dredge or that enters its during its turn takes 4 (1d8) 1d8 acid damage. On initiative count 20, creatures within 5 feet of the dredge must make a DC 15 Dexterity saving throw as the dredge oozes up the walls and towards them. Creatures who fail take 4 (1d8) 1d8 acid damage and are restrained. A creature restrained by the dredge can use its action to make a Strength check of DC 10. If it succeeds, it is no longer restrained.