Arachnut

From KeenWiki

The Arachnut is an invincible and hostile creature with two mouths full of sharp teeth, and many eyes in their center.

Arachnuts are inhabitants of the Shadowlands, and they prefer the hot, arid climate of the pyramids and places like Sand Yego, ideally underground and close to water, as would be expected from a desert dwelling creature. One shot can stun an Arachnut temporarily, but there's no way to stop it permanently.

The official help says of the Arachnut:

Insane, green, crab-walking creatures with two dangerous mouths.

The name 'Arachnut' appears to be a portmanteau of the words 'arachnid' (spider-like) and 'nut', in reference to its spider-like legs (although this is more accurately described as crab-like since it walks sideways) and to its apparently erratic or insane behavior (its eyes look in random directions, and it scurries quickly and randomly.)

See also List of Keen 4 Creatures.