Heliana's Guide to Monster Hunting, pg. 215
Amorphous. The ooze can move through a space as narrow as 1 inch wide without squeezing.
False Appearance. While the ooze remains motionless, it is indistinguishable from an oily pool or wet rock.
Spider Climb. The ooze can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Pseudopod. Melee Weapon Attack: your spell attack modifier to hit, reach 5 ft., one target. Hit: 1d6 + PB bludgeoning damage