What the Xanxost want is simple: They want a home. The fact that this planet is already occupied, and coexistence is probably impossible, is just a minor inconvenience. They will slowly spread their toxic gasses and strange plants across the world, unless they are stopped or a better solution is found.
Xanxostans are slug-like creatures, roughly four feet in length, with four nubs in place of limbs. Their form makes them weak and slow, but they are rarely seen like this.
Xanxostans often wear six foot tall iron suits that look like a headless, hunched-over person. Xanxostans themselves ride in a chamber in the upper portion. Two arms on either side can be swapped for various tools, like pickaxes or hoes. These suits make them formidable combatants, but a well placed blow to a Xanxostan's driving chamber can disable them. And also kill the Xanxost inside, obviously.
Xanxost are currently most often found on Ibos as an unexpected side effect of the Schism of Rampart.Their intentions, as noted by the Seventh Legion, are unknown.