Sand Trappers

The sand trappers of Mars surely look dangerous, but are immobile.

Description
One might think that these monsters can be easily avoided since they are immobile, but they are extremely crafty to get their prey. These smaller cousins of the leviathan wait under the sand until prey comes by, only to suddenly appear and grab it with its tentacles. Should the prey try to resist, it spits a paralyzing venom at it. It can only be effectively killed in a group, not alone.

Sand trappers can appear anywhere on the surface.