Flash Jelly

AC 8

HP 45 (6d10 + 12; bloodied 22)

Speed 15 ft., climb 15 ft., swim 15 ft.

Proficiency +2; Maneuver DC 12

Damage Immunities acid, lightning, slashing

Condition Immunities blinded , charmed , deafened , fatigue , frightened , prone

Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8

Languages —

Amorphous. The jelly can pass through an opening as narrow as 1 inch wide without squeezing.

Spider Climb. The jelly can use its climb speed even on difficult surfaces and upside down on ceilings. 

Sunlight Sensitivity. While in sunlight, the jelly has disadvantage on attack rolls.

Ooze Nature. An ooze doesn’t require air or sleep.

Hypnotic Display (Recharge 5−6). Each creature within 10 feet of the jelly that can see it must succeed on a DC 12 Wisdom saving throw or be charmed for 1 minute. While charmed in this way, a creature is incapacitated and has a speed of 0. The creature can repeat the save at the end of each of its turns, ending the effect on itself on a success. The effect also ends if another creature uses its action to shake the creature out of its trance, or if the creature takes any damage.

ACTIONS

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 3 (1d6) acid damage, and the target is grappled (escape DC 12). A grappled target takes 3 (1d6) acid damage at the start of each of the jelly’s turns.

REACTIONS

Split. When a Medium or larger jelly with at least 10 hit points is subjected to lightning or slashing damage, it splits into two jellies that are each one size smaller, freeing any grappled targets. Each new jelly has half the original’s hit points (rounded down).

Sudden Flash. When the jelly is hit with a weapon attack, it produces a sudden flash of light. Each creature within 10 feet that can see the jelly must succeed on a DC 12 Dexterity saving throw or be blinded until the end of its next turn.