Octopus

Octopi were a breed of multi-tentacled cephalopods that lived within the ocean.

Combat
Generally, regular octopi were not dangerous unless provoked, and in this case, would usually try to escape. Many evolved the ability to blend into their environment. They could not only change the color of their skin, but also use muscle action to change its texture to appear more like whatever they were blending against. If they were pursued by predators, octopi were capable of expelling a cloud of ink before swimming away. Some octopi were venomous, capable of producing a paralytic neurotoxin.

Ecology
They made their homes along the bottom of the sea, particularly within coral reefs. Octopi were quite intelligent as mollusks went and were capable of complex tactics in their pursuit of food.

Varieties

 * Blue ring octopus : Inherently good creatures that dwelt in the oceans of the Underdark, trying to avoid the more powerful races with which they shared territory.
 * Giant octopus : Unlike regular octopi, they were aggressively territorial and could have tentacles up to 10 ft (3 m) long.
 * Octo-jelly : A blind, bell-shaped octopus with the ability to change color.