Huge Undead, neutral evil
Armor Class 15 (natural armor)
Hit Points 126 (12d12+48)
Speed walk +40
Challenge 6
Skills perception -1
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 60', passive Perception 9
Languages understands Common and Darakhul but can't speak
Siege Monster. Double damage to objects/structures.
Undead Nature. Doesn't require air food drink or sleep.
Unstable Footing. Has disadvantage on saves vs. being knocked prone.
Multiattack. Two Chain Lash attacks.
Chain Lash. Melee Weapon Attack: +8 to hit, 15 ft., one target, 18 (4d6+4) slashing damage and the target is grappled (escape DC 15). The reaver has four chains each of which can grapple only one target.
Bladed Sweep (Recharge 5-6). Swings its chains in a wide arc. Each creature within 15 ft. of the reaver must make a DC 15 Dex save. On a failure a creature takes 21 (6d6) slashing damage and is knocked prone. On a success a creature takes half the damage and isn't knocked prone. A creature that fails the save by 5 or more is pushed up to 15 ft. away from the reaver and knocked prone.
Source: Tome of Beasts 3 · OGL/Open