"The Bake-kujira, a skeletal whale, unknown in size but estimated to be over a hundred feet long. Bones are white and heavily dense. Traditional weapons up to Class Four are almost useless against its frame. Being in the water, its bones are glossed and wet and so explosive and fire element attacks are ineffective. Weapons will need to be designed to penetrate the bones."
"So lightning will be super effective."
"Yes. Do not expect it to be easy though. Its flames are a whole other problem—mana-infused yokai fire that can incinerate an island in seconds. And then, of course, there's the plague."
"And steam."
"Steam?"
Ah, so the professor didn't know. It seemed the history books didn't know everything.