Spider climb.It can climb on any surface.

Spider Silk. It can produce an extremely sticky silk from its body. This silk sticks to any substance object it is touching.

Dissolve. Melee Weapon Attack: +2 to hit, reach 5ft., 3target. Hit: 15 (3d6 + 2) acid damage. 

Acidic silk thread. RangedWeapon Attack: +5 to hit, range 30/40 ft., 1 target. Hit: 14(2d#8 + 2) acid damage. Restrains target.

Silk thread. It emits a long silk string that pulls in any who are touched by it by up to 20ft and restrains them.

Split. If the creature is medium or higher, it will split into two slimes of the smaller variant upon reaching half health.

Envelop.  If the creature is larger than the target, then it can envelop them, restraining them and allowing them to attack the target twice per turn.