Obsidian Retriever [Dark Sun]

It looks like a giant spider, but the obsidian retriever is a golem of volcanic glass made by long-lost sorcery of the desert world, perhaps a failed attempt to copy the planar retriever. Its four forelegs end in barbed needles. Two of its six eyes see; the other four hold magic.

It sits motionless until its treasure is touched, then attacks relentlessly. Usually it begins with an eye, each linked to an elemental sphere: earth casts flesh to stone, air a sand storm, fire a fireball, water an ice storm, all as the spells at 15th level. An eye then rests 5 rounds before reuse.

Rearing up, it can also stab with all four barbed legs for 3d6 each, against one or several foes. When all four strike one target, that victim is trapped in the needles and must save vs. breath weapon every round or take 4d6 more. Escape takes a bend bars/lift gates success.

Only +2 or better weapons hit it, and mind-affecting spells fail. Fire spells and bladed weapons do half damage, electricity and lightning double, and blunt weapons get +1 damage against its brittle glass. A rock to mud spell slows it for 2d6 rounds.

A thief who escapes is hunted down with innate, at-will locate object and find the path. Recovering the item is its sole aim; anyone interfering is attacked.

Dragon kings prize these constructs and control them through tremendously powerful psionics. Others still guard treasures in the ruins of vanished civilizations. A retriever never acts unbidden and must be psionically ordered to guard an object or take an action. Even through shared thought, it understands only simple commands.

Not part of any natural order, it needs neither food nor rest and endures until destroyed. Broken areas heal if coated with a mud made of obsidian dust and then targeted by mud to stone.