Originally Posted by
Deftscythe
The souls of the members of the Hydra Corps are trapped in dynamis. Adventurers never die, only get KO'd. Therefore, there's no way we can take the role of the Hydra Corps unless there are a ton of NPC members as well.
Some Members Died, Tons of NPCs, Not a ton is known about them except they were ultra-elite and kind of spontaneously appeared, yeah... doesn't sound so unlikely at all.
The fact that it says they disappear, not just die, is kind of an interesting tell.