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Giant Jellyfish CR: 5

Large beast, unaligned

Armor Class: 13 (Natural Armor)

Hit Points: 90 12d12+24

Speed: 0 ft , swim: 20 ft

STR

10 +0

DEX

16 +3

CON

14 +2

INT

5 -3

WIS

12 +1

CHA

8 -1

Skills: Perception +7

Damage Resistances: Lightning

Condition Immunities: Blinded, Charmed

Senses: Blindsight 60 ft. (blind beyond this radius), passive Perception 13

Challenge Rating: 5 ( 1800 XP)

Proficiency Bonus: +3

Water Breathing. The jellyfish can breathe only underwater.
Shocking Defense. Whenever a creature hits the jellyfish with a melee attack, grapples the jellyfish, or touches the jellyfish, they suffer 13 3d8 lightning damage.

Actions

Multiattack. The jellyfish makes two tentacle attacks.
Tentacle. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 4 1d6+3 bludgeoning damage plus 9 2d8 lightning damage.
Mesmerizing Movement (2/day). Each creature within 100 feet of the jellyfish that can see it must succeed on a DC 15 Wisdom saving throw or become charmed by the jellyfish for 10 minutes. While charmed, the creature must use its movement and action to get as close as possible to the jellyfish and touch it. Whenever a creature suffers damage, it repeats the saving throw.

Reactions

Water Burst. Upon taking damage, the jellyfish can use its reaction to swim up to 10 feet in a single direction. Any creature directly opposite the direction the jellyfish travels is pushed back 10 feet.