The spear of rock did more damage then hurling boulders could. The spires of ice were hard, and just bashing them would do very little, aside from weaken them. Still, that one attack did almost nothing. Over a few tries, it was showing effect, the concentrated fire sending more and more cracks through, weakening the entire thing. One solid blow was all it took after this to blast a large chunk out of it and cause most of one side to slide into the water.<br/><br/>Isabeau knew they'd figure that out sooner or later, so left the last one perfectly formed, strong like it was concrete riddled with metal bars. There was no weak spot to exploit. She watched from her small garden over by the tower, curious how they'd handle it.