Huge Construct, unaligned
Armor Class 20 (natural armor)
Hit Points 178 (17d10+85)
Speed walk +30
Challenge 11
Skills perception +0
Damage Resistances acid, fire
Damage Immunities poison, psychic; nonmagic bludgeoning, piercing, and slashing attacks not made with adamantine weapons
Condition Immunities blinded, charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 120', passive Perception 10
Languages understands creator's languages but can't speak
Adaptable Locomotion. Moving through difficult terrain doesn't cost it extra movement. In addition it has advantage on ability checks and saves made to escape a grapple or end the restrained condition.
Construct Nature. Doesn't require air food drink or sleep.
Defensive Mount. Can serve as a mount for one Large creature up to 4 Med creatures or up to 6 Small or smaller creatures. While mounted creatures riding in siege engine's turret gain half cover.
Immutable Form. Immune: form-altering spells/effects.
Magic Resistance. Advantage: spell/magic effect saves.
Siege Monster. Double damage to objects/structures.
Multiattack. Three Slam attacks.
Slam. Melee Weapon Attack: +10 to hit, 10 ft., one target, 22 (3d10+6) bludgeoning damage.
Acid Jet (Recharge 5-6). Sprays jet of acid in 30' line by 5 ft. wide. Each creature in line: 40 (9d8) acid (DC 17 Dex half).
Source: Tome of Beasts 3 · OGL/Open