[She sure is curious about all this...well, whatever. Nobunaga's partially to blame for bringing it up.]

Ah, I just remembered! [No she didn't.] Actually, this caster in particular isn't a simple caster...they are a grand caster. It serves as a special container that allows a heroic spirit to have access to the full breadth of their abilities; absolutely no limits.

So even if the likes of the King of Knights, Heroes, Conquerors and...well, even I, powerful as I am...were we to battle him united, we'd lose almost instantaneously. Speaking of classes, I was an Archer, to answer your question.

[Which might be expected. The class full of jerkasses.]

Although I wasn't there when he was confronted in London. Apparently he boasted an advantage over knight classes...perhaps if ever you run into the others you could ask them.