The pillar of fire was actually a very good idea, as it roasts all but a few of the babies. Some of them were still in the process of hatching, so they had not gotten out of the building yet, and thus were safe. The rest, however, are dead.

But the mama lizard monster, it is roaring in pain and anger and it swirls around in the tornado of fire. It can't escape, and the fire is damaging it, but it isn't dead. In fact, the fire doesn't seem to be doing much damage to it. The same goes for the ice shards, too: some damage is done, but all it does is injure, not kill. This is beefy lizard monster that will take cooperation from several parties to beat.