Blue-ringed octopus

Ring color change
When it feels threathened the Blue-ringed octopus can make the colors of its rings change to confuse its enemies. Enemies have to make a DC 14 WIS save or suffer the same effects as the confuse spell.

Squeeze
The Blue-ringed octopus can squeeze through gaps of 5 inches.

Water breathing
The Blue-ringed octopus only breathes in water.

Hold breath
The Blue-ringed octopus can hold its breath outside of water for 5 minutes.

Bite
The Blue-ringed octopus bites its opponent with its beak and the target is subjected to Blue-ringed octopus venom, wich is described in the "Venom Extractor" rogue subclass.
Melee weapon attack: + 2 to hit, reach 5 ft., 1 target. Hit: 3 (1d4 + 1) piercing damage and the target is subjected to Blue-ringed octopus venom.