Armor Class 14
Hit Points 71 (13d8 + 13)
Speed 40 ft., climb 40 ft.
Saving Throws DEX +7, CON +4
Skills Stealth +7
Damage Resistances cold
Damage Immunities psychic
Condition Immunities charmed, frightened, prone
Senses darkvision 60 ft., passive Perception 11
Languages Deep Speech
Challenge 5
Ambusher. On the first round of each combat, the mangler has advantage on attack rolls against a creature that hasn't taken a turn yet.
Shadow Stealth. While in dim light or darkness, the mangler can take the Hide action as a bonus action.
Multiattack. The mangler makes two claw attacks.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage. If the attack roll has advantage, the target also takes 7 (2d6) psychic damage.
Flurry of Claws (Recharge 4–6). The mangler makes six claw attacks against one target. Either before or after these attacks, it can move up to its speed as a bonus action without provoking opportunity attacks.
Mordenkainen's Tome of Foes, p. 236