Octopus 2014
CR 0 beast
Small beast, chaotic evil
While out of water, the octopus can hold its breath for 30 minutes.
The octopus's Stealth is 18 while underwater.
The octopus can breathe only underwater.
Actions
Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4+1) bludgeoning damage, and the target is grappled (escape DC 11), if it is a Medium or smaller creature. Until this grapple ends, the octopus can't use its Tentacles on another target.
Reactions
When a creature the octopus can see deals damage to it, the octopus can release a 5-foot-radius cloud of ink all around itself, if it is underwater. The area is heavily obscured until the end of the octopus's next turn, although a significant current can disperse the ink. Then, the octopus can swim up to its swimming speed. If it does so, it immediately releases any creature it is grappling.
Other versions
Source: Black Flag SRD (Kobold Press) · License: Creative Commons Attribution 4.0 details