Another Stars Without Number xenobeast:
Castoran Salt Worm
Armor Class: 6
Hit Dice: 2+2
Attack Bonus: +3
Damage: 2d4+2 bite
No. Appearing: 1
Saving Throw: 14+
Movement: 20 ft., burrow 10 ft.
The Castoran salt worm is a solitary ambush predator that grows to lengths of 10 to 15 feet and weights of 75 to 125 pounds. It spends most of its time lurking in a vertical burrow just a foot or two beneath the surface. Its leathery, boneless body is covered with millions of sensory hairs that detect minute changes in pressure, such as those caused by a creature walking across the surface of the salt flats these worms prefer to lair in.
The Castoran salt worm’s lightning fast strike (+1 initiative rolls) as it erupts from its burrow has a 75% chance of gaining surprise. The worm attacks with its crushing bite.
Fortunately, Castoran salt worms are not especially aggressive or voracious. This xenobeast is likely to retreat if strongly opposed, and its slow metabolic rates require it to consume little more than half its body weight a month.