Stone Colossus

Ages before the lizard folk arrived, a race of giants ruled a prime world until a great plague wiped them out. In their glory they crafted many magical wonders, including warriors to fight for them and to guard the monuments they so prized, so that no later race could erase their memory. The only such warriors left are the Walking Statues, or stone colossi, each a stone golem of tremendous power.

It fights like a larger stone golem that cannot cast slow. It is made to strike only with its fists and never uses weapons, and it counts as Strength 23 for breaking or throwing things. Only weapons of +2 or better can hurt it. Rock to mud slows it for 2d6 rounds, while mud to rock heals all its damage. Flesh to stone does it no harm but leaves it open to normal attacks the next round. No other magic affects it.

Its march is terrifying. Anything with fewer than 3 Hit Dice drops what it carries and runs for 2d6 rounds. Creatures of 3 to 5 Hit Dice resist with a save vs. wand, and those of higher level or Hit Dice are immune.

A colossus is an automaton obeying whoever can work the runes of its making. Once awake, it seeks out and smashes any structure its makers did not build. That programming could in theory be changed, but no one has yet found the rite. Halting a rampage takes a ritual lasting days, with glyphs drawn on every colossus, active or dormant.

Being artificial, colossi have no ecological role. They do not eat, sleep, or truly live, and they carry out their orders until destroyed, shut down, or finished.