A tower of natural glass caused by a lightning strike hitting a patch of sand. Although the cat who saw the strike causing it we scared out of their wits, they still came back and told the Clan about it. Seeing as they had been debating the sense of continuing the quarrel with ForestClan, they saw this as StarClan's sign that their Clan was mighty enough to build and burn at the same time, making them the most powerful of the Clans. They all agreed that this meant that if one Clan opposed them, they would need to strike it down and build it up, so it would still be great enough to join in their empire.