monsters construct cr-11-16 Tome of Beasts 3

Arcane Leviathan

Gargantuan Construct, CR 16. From Tome of Beasts 3.

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Arcane Leviathan

Gargantuan Construct, unaligned

Armor Class 17 (natural armor)

Hit Points 279 (18d20+90)

Speed 10 ft., swim 60 ft.

STR
26 (+8)
DEX
5 (-3)
CON
21 (+5)
INT
5 (-3)
WIS
17 (+3)
CHA
8 (-1)

Saving Throws Str +1, Con +1, Int +2, Wis +8, Cha +4

Skills Perception +3

Damage Immunities lightning, poison, psychic

Condition Immunities blinded, charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned

Senses truesight 120', passive Perception 13

Languages understands creator's languages but can't speak

Challenge 16 (15,000 XP)

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.

Actions

Multiattack. One Slam and two Claws or four Lightning Bolts.
Claw. Melee Weapon Attack: +13 to hit, 15 ft., one target, 26 (4d8+8) slashing damage. If target is Huge or smaller it is grappled (escape DC 19). Leviathan has two claws each of which can grapple only one target.
Slam. Melee Weapon Attack: +13 to hit, 5 ft., one target, 18 (4d4+8) bludgeoning damage and target: DC 19 Str save or be knocked prone.
Lightning Bolt. Ranged Spell Attack: +8 to hit 150/600' one target 17 (4d6+3) lightning.
Pylon Discharge (Recharge 5-6). Discharges energy surge at a point it can see within 200' of it. Each creature within 30' of that point: 45 (10d8) lightning and is blinded until the end of its next turn (DC 19 Dex half damage not blinded).

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