A Globe of Change is made from vitrified warpstone. Warpstone is the raw stuff of the Realm of Chaos; large chunks of it were sucked into the material world with the collapse of the Slann's warp gates. Most of this material ended up scattered over the entire world as fine black dust, but larger pieces are sometimes found. Warpstone is pure magical energy, and its ability to cause change is very great indeed. The Globe of Change looks like a black glass ball with the rune of Tzeentch carved over its surface, forming a complex interlocking pattern.