Cave Sovereign 2014

CR 16 aberration

Huge aberration, chaotic evil

Armor Class: 18 (natural armor)
Hit Points: 253 (22d12+110)
Speed: 40 ft., climb 30 ft.

STR25 (+7)

DEX8 (-1)

CON20 (+5)

INT16 (+3)

WIS12 (+1)

CHA20 (+5)

Saving Throws: Constitution +1, Intelligence +8, Wisdom +6
Skills: Perception +1
Resistances: poison, radiant; nonmagic B/P/S attacks not made w/adamantine weapons
Damage Immunities: psychic
Condition Immunities: charmed, frightened
Senses: darkvision 120 ft., tremorsense 60 ft., passive Perception 16
Languages: understands all but can't speak, telepathy 120'
Challenge: 16 (15,000 XP) · Proficiency Bonus +5

Deathlights.

When a creature that can see sovereigh's glowing antennae starts its turn within 30' of it sovereign can force it to make a DC 18 Wis save if sovereign isn’t incapacitated and can see the creature. If save fails by 5+ creature is stunned until the start of its next turn. Otherwise creature that fails is incapacitated and its speed is reduced to 0 until start of its next turn as it remains transfixed in place by the lights. Unless surprised creature can avert its eyes to avoid the save at start of its turn. If creature does so it can’t see sovereign until start of its next turn when it can avert again. If creature looks at sovereign in the meantime it must immediately save.

Illumination.

Its antennae shed dim light in a 5 ft. radius. Radius increases to 20' while at least one creature is incapacitated or stunned by Deathlights. At start of its turn if no creatures are incapacitated or stunned by Deathlights sovereign can suppress this light until start of its next turn.

Inscrutable.

Immune to any effect to sense its emotions or read its thoughts as well as any divination spell it refuses. Wis (Insight) checks made to ascertain sovereign's intentions or sincerity have disadvantage.

Legendary Resistance (3/Day).

Choose to succeed failed save.

Magic Resistance.

Advantage: spell/magic effect saves.

Sinuous Form.

Provided there is suitable room to accommodate its bulk can squeeze through any opening large enough for a Small creature.

Spider Climb.

Difficult surfaces even ceilings no ability check.

Legendary Actions

Move.

The cave sovereign moves up to its speed with o provoking opportunity attacks.

Telekinetic Reel.

Magically pulls incapacitated or stunned creature by its Deathlights it can see up to 20' straight toward it.

Cast a Spell (Costs 2 Actions).

Uses Spellcasting.

Tail Attack (Costs 2 Actions).

Makes one Tail attack.

Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details