This creature appears to be a large snake formed of earth and sand. A slit seems to function as the creature’s mouth.
Sandling CR 2
XP 600
N Large outsider (elemental, extraplanar, earth)
Init +1; Senses darkvision 60 ft., tremorsense; Perception +10
Environment Elemental Planes of Earth
Organization solitary
Treasure none
Sandlings are creatures from the Elemental Planes of Earth. A sandling in its natural form resembles a mound of sand that covers a 10-foot area. They are most often summoned to the Material Plane by clerics and wizards, though on occasion a sandling slips through a vortex connecting the Elemental Planes of Earth to the Material Plane. Sandlings live on a diet of minerals only and cannot digest plants, herbs, meat, or other substances. Opponents killed by a sandling are left for scavengers.
A sandling lies in wait in its natural form until it detects an interloper in its territory. It then assumes its serpentine form and attacks with an abrasive bite.
A typical sandling is 10 feet long but can grow to a length of 20 to 25 feet.
Sandling from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene, based on original material by Lawrence Schick.