Stone gools are incredibly powerful forest creatures with skin made of malleable stone. As they age, they grow additional sets of arms on a taller and taller frame until they max out around the same height as trees, at which point it becomes incredibly difficult for them to maneuver around the forest quickly. While they are young and smaller, however, they are extremely fast and extremely strong and have no known predators, using brute strength to take whatever they want from whoever they want.