This creature is a large spheroid with ten octopus-like tentacles protruding from its body. Hair grows in broken patches on its body.

Its eyes are stark white and pupilless. Its large mouth sports long, yellow fangs.

Decapi are solitary creatures that dwell in dense forests or underground. Most prefer the forests as their ability to move among the trees allows them to either pursue their prey or flee in situations not to their advantage. On the ground, decapi are slowmoving, thus they spend most of their time among the treetops.

Decapi are nocturnal hunters and are quite fond of human, elf, and halfling flesh. In times when food is scarce, they exist on a diet of rats, snakes, and other small forest creatures (or dungeon denizens in the case of the subterranean decapus).

Decapi prefer a solitary life; the only time more than one will ever be encountered together is during mating season (usually the fall). Young decapi are born live, and the female only ever gives birth to a single young during each mating season. If food is extremely scarce, some decapus females have been known to eat their young.

This creature's body is a 4-foot diameter globe of pallid green. On rare occasions, a purple or even yellow hued decapus may be encountered. Patches of dark hair, brown or black, grow in various locations. Regardless of its body color, each decapus has 10 octopus-like tentacles protruding from its spherical body. Each tentacle is covered in suction cups that aid the creature in not only climbing and moving through trees but also in holding on to its prey. Its large wide maw sports sickly yellow teeth and foul breath. Decapi seem to be able to speak with others of their kind using a series of guttural noises.