Arcane Leviathan 2014

CR 16 construct

Gargantuan construct, unaligned

Armor Class: 17 (natural armor)
Hit Points: 279 (18d20+90)
Speed: 10 ft., swim 60 ft.

STR26 (+8)

DEX5 (-3)

CON21 (+5)

INT5 (-3)

WIS17 (+3)

CHA8 (-1)

Saving Throws: Strength +1, Constitution +1, Intelligence +2, Wisdom +8, Charisma +4
Skills: Perception +3
Resistances: acid, thunder; nonmagic B/P/S attacks
Damage Immunities: lightning, poison, psychic
Condition Immunities: blinded, charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned
Senses: truesight 120 ft., passive Perception 13
Languages: understands creator's languages but can't speak
Challenge: 16 (15,000 XP) · Proficiency Bonus +5

Construct Nature.

Doesn’t require air food drink or sleep.

Impregnable.

If subjected to an effect that allows it to make a save to take only half damage it instead takes no damage if it succeeds on the save and only half damage if it fails.

Siege Monster.

Double damage to objects/structures.

Bonus Actions

Arcane Barrage.

Sends arcane energy toward a creature it can see within 120' of it. Target begins to glow with arcane energy and at end of target's next turn: 35 (10d6) radiant (DC 19 Con half). Damage is divided evenly between target and all creatures within 10 ft. of it except leviathan.

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