Explosive Death. If damage reduces the Abomination to 0 hit points the foul ooze that animates them bursts out in a 10 ft radius from their location. All creatures within that radius must make a DC 15 Constitution saving throw or be infected with a corrupting disease.  Once infected, the victim becomes poisoned until the disease is cured. While poisoned, the victim cannot regain hit points except by magical means, and the target's hit point maximum decreases by 4 (1d8) every 24 hours. If the target's hit point maximum drops to 0 as a result of this disease, the target dies and is reanimated as an Abomination.

Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 5) bludgeoning damage.

Embrace. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit:  8(1d6 + 5) bludgeoning damage. Upon a hit, the target needs to make a DC 14 Dexterity saving throw or they will receive an additional 12 (2d6 +5) Necrotic Damage and be Restrained until they can make a successful DC 12 Strength saving thrown or the monster is takes damage from another target. Restrained creatures automatically fail the Dexterity saving throw to leave the embrace.   

Liquefy. As a move action, the Abomination can liquefy and re-from in any square within a 30 foot radius of its starting point. This action prevents attacks of opportunity from being taken against it.  While in a liquid state, the Abomination can move through a space as narrow as 1 inch wide without squeezing.

Whisper. As a bonus action the Abomination can whisper disturbing, horrible things in an unknown language that are heard differently by each person in range (50 ft). Those in range must succeed a DC 10 Wisdom saving throw or be frightened for 1d4 rounds.