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.

Transparent. Even when the jelly is in plain sight, it takes a successful DC 13 Wisdom (Perception) check to spot a jelly that has neither moved nor attacked. A creature that tries to enter the jelly's space while unaware of the jelly is surprised by the jelly.

Pseudopod. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 3 (1d6) psychic damage.

Mana Drain. If a target is hit by a Pseudopod attack and has spell slots, it loses a number of spell slots equal to the psychic damage.

Split. When a jelly that is Medium or larger is subjected to psychic or slashing damage, it splits into two new jellies if it has at least 10 hit points. Each new jelly has hit points equal to half the original jelly's, rounded down. New jellies are one size smaller than the original jelly.