Amorphous. The jelly can move through a space as narrow as 1 inch wide without squeezing.

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

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 3 (1d6) acid damage. Instead of dealing damage, the jelly can grapple the target (escape DC 13).

Engulf. Melee Weapon Attack: +6 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the jelly. Hit: 7 (2d6) acid damage. Instead of dealing damage, the jelly can restrain the target (escape DC 13).

Body Thief. The aberrant jelly initiates an Constitution contest with a restrained humanoid within 5ft that isn’t protected by protection from evil and good. If it wins the contest, the pours itself into the target, and takes control of the target’s body. The jelly retains its Intelligence, Wisdom, and Charisma scores. It otherwise adopts the target’s statistics, but cannot cast any spells the creature may know.

While inside a creature, the jelly has total cover against attacks and other effects originating outside its host. Each round while the jelly is inside of its target, they must make a DC 13 constitution save or take 3 (1d6) acid and 4 (1d6) necrotic damage.  If they die from this damage, they rise as a slime zombie after 1d4 rounds as the jelly uses its own body to convert them.

If the host body dies before the conversion is complete, the aberrant jelly must leave it. A protection from evil and good spell cast on the body also drives the jelly out. By spending 10 feet of its movement, the aberrant jelly can voluntarily leave the body, flowing to the nearest unoccupied space within 5 feet of it and dealing 10 (3d6) acid damage to its former vessel.