When defiling magic is used to slaughter innocents, a residue can cover the drained land. This foul miasma mixes with the ground to create black sand, which poisons the landscape and any creature that passes through it.
Effect: A creature in a square of black sand regains half the normal number of hit points.
Usage: Black sand terrain adds a flavorful dash of Athas to an encounter. It also requires characters to consider their positioning before they use their second wind or healing powers.
Published in Dark Sun Creature Catalog, page(s) 134.