Plague of Froggoth

Gargantuan swarm of small aberrations, unaligned

Armor Class

14

Hit Points

324 (24d20 + 72)

Speed

30 ft., swim 30 ft.

Skills

Perception +13

Damage Immunities

psychic

Senses

truesight 90 ft.

Languages

Challenge

14

Amphibious

The plague of froggoth can breathe air and water.

Standing Leap

The plague of froggoth's long jump is up to 10 ft. and its high jump is up to 5 ft., with or without a running start.

Psychic Miasma

All creatures within 30 feet of the plague of froggoth that are not a froggoth must succeed a DC 21 Wisdom saving throw. On a failed save, the creature becomes charmed. While charmed by this effect, the creature is incapacitated and has a speed of 0. The spell ends for an affected creature if it takes any damage or if someone else uses an action to shake the creature out of its stupor.

Hallucinatory Aura

Any creature within 500 feet of the plague of froggoth that is not a froggoth must make a DC 21 Wisdom save. On a failed save the creature views the terrain as shifting and swirling. The area becomes difficult terrain and it is impossible to determine the location of environmental hazards. The plague of froggoth is also invisible to the creature. On a successful saving throw, the creature is immune to the plague of froggoth's aura for 1 minute.

Swarm

The plague can occupy another creature's space and vice versa, and the plague can move through any opening large enough for a froggoth. The plague can't regain hit points or gain temporary hit points. The effective range of the aura is halved when the plague's HP is reduced below half.

Actions

Psychic Shock

Ranged Spell Attack: +16 to hit, range 80 ft., one target. Hit: 8d12 psychic damage (4d12 psychic damage if the plague is below half HP). The plague of froggoth can only use this action against a target that is charmed by Psychic Miasma.