Alien Squid

Alertness. The alien squid has advantage on Wisdom (Perception) checks.

Multi Attack. If the Alien Squid successfully grapples a creature, it immediately makes a bite attack on that creature.

Tentacles. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) bludgeoning damage. If the target is a medium or smaller creature, it is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the alien squid can't use its tentacles on another target.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. 

Ink Cloud (Recharges after a Short or Long Rest). A 20- foot-radius cloud of ink extends all around the alien squid. The area is heavily obscured for 1 minute, although a significant wind can disperse the ink. After releasing the ink, the alien squid can use the Dash action as a bonus action.