Dragonwriter
First Post
keep the dune stable, otherwise it would move around and generally wreak havoc (monster idea? hmm...)
For 3.5 (/PF-compatible), you might find something in Sandstorm.
Or if you go the Undead route, something really big (Corpse Gatherer, MM2, perhaps?) + Swarm-Shifter template -Undead Sand swarm version (Libris Mortis). Behold, the un-living dune-monster!

Incidentally, Swarm-Shifter is also the perfect template for creating Imhotep from the The Mummy ('99). In case anyone ever had the idea to make him a BBEG for a game.
