Chain Octopus

Slippery Escape: When the Chain Octopus is grappled, restrained, or affected by a similar effect, it can use its reaction to attempt to slip free. The Octopus makes a Dexterity saving throw with a DC of 15. On a successful save, it slips free and can move up to half its speed without provoking opportunity attacks.

Multi-Grapple: The Chain Octopus can use its tentacles to grapple up to 8 creatures at a time. It can make a tentacle attack against each creature within its reach. If it hits with a tentacle attack, the target is grappled (escape DC 16). The Octopus can use its bonus action on subsequent turns to maintain all its grapples.

Multiattack: The Chain Octopus makes four attacks. It can choose between Tentacle attack or Chain Slam.

Tentacle: Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 18 (2d8 + 5) bludgeoning damage, and the target is grappled (escape DC 16).

Chain Slam: The Chain Octopus slams a grappled creature into the ground or a solid object nearby. The grappled creature takes 26 (4d8 + 5) bludgeoning damage on a failed Strength saving throw (DC 16), or half as much damage on a successful one. The grappled creature is then released from the grapple.

Ink Cloud (Recharge 5-6): The Chain Octopus expels an ink cloud in a 30-foot radius. The area becomes heavily obscured, and creatures within the cloud are blinded. The cloud lasts for 1 minute or until dispersed by wind or a strong current.

Rend Chains (Recharge 5-6): The Chain Octopus can use its bonus action to make a powerful swing of its iron chains in a 10-foot radius around itself. Each creature within the area must make a DC 16 Dexterity saving throw or take 21 (6d6) bludgeoning damage and become grappled by the chains (escape DC 16). On a successful save, the creature takes half damage and isn't grappled.

Iron Deflection: When the Chain Octopus is targeted by a melee weapon attack and the attack misses, it can use its reaction to make a Dexterity check (adding its Dexterity modifier). If the result of the check is equal to or higher than the attacker's attack roll, the octopus disarms the attacker and takes their weapon. On its turn, the octopus can use the disarmed weapon to make a melee weapon attack against a creature.