D&D 5th Edition Data Explorer

Tentacles
Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage, and the target is grappled (escape DC 10). Until this grapple ends, the octopus can't use its tentacles on another target.
attack bonus:
4
damage:
- 1
  Bludgeoning
Ink Cloud
A 5-foot-radius cloud of ink extends all around the octopus if it is underwater. The area is heavily obscured for 1 minute, although a significant current can disperse the ink. After releasing the ink, the octopus can use the Dash action as a bonus action.
usage:
rest types:
short
long
type:
recharge after rest