(If I missed some details, please bear with me. It's been a busy time for me IRL. I'll focus on Cadmus for now and catch up with Asthia later. And it's spelled "Cadmus", not "Camdus", and he's not THAT powerful. Strong, yes. OP, no.)

Cadmus looked down at Zmerr and the others. He was a large, silver dragon, with blue eyes, long wings, and several horns, although his most notable feature were the two main horns extending from the back of his head. A crackle of light-blue magic would race up the horns from time to time, giving the appearance of tines of blue lighting. He spoke in a voice which reflected a will of iron, yet was surprisingly gentle for one as large as him.

"I shall tend to the fire myself and get to the bottom of this later. I have sensed the arrival of several new students, and shall tend to them as well. I didn't sense the flames, which tells me that whoever set it must be a powerful mage in his own right." 

He rose to his feet, standing on the large pillow on which he had been resting, large enough for a pair of elephants to comfortably curl up on with room to spare. Cadmus spread his wings and looked up at the skylight in the ceiling. The oculus was large enough to let him fly through without difficulty. As he began to flap his wings, he spoke to the others in the room. 

"Thank you for bringing this to my attention. If you need anything, I'll be at the stables!" Cadmus flew up through the hole in the roof, cutting through the night sky. He found the raging green flames and landed in front of it, careful not to injure anyone who was around. The silver dragon sniffed the air and let out a loud growl. The magic used to power this fire was indeed powerful. He stood up on his hind legs and traced a pattern in the air with front right claw. The resulting shape had the same color as the magic which danced across his horns, which increased in intensity as he trace the pattern.

After about thirty seconds, the pattern looked like a circle filled with interlocking triangles. When it was completed, he waved his hand across the pattern, and it brought forth a burst of deep blue water, colored a deeper shade of blue than any natural water in the material plane. The water quickly extinguished the fire, and once Cadmus was satisfied that the flames were out, he turned to those around him.

"Anyone care to explain what happened?" His tone was commanding, but not harsh.