...Whatever those 'trump cards' are, I bet none of them directly risk that king's own health. After all, he is the type to force others to endure inhuman treatment to gain the power he wishes them to obtain, then after he's done using them, arrange their deaths by whatever means necessary (with...
Villain: I have this S-rank stat increase potion, you can't win.
Heroine teleports away. "About five minutes should be long enough for the side effects to kick in."
Well, we all knew they'd be joining the crew (even if they are not official crew members). If things go as it did with the other girls its just a matter of time before they both become lovers as well.
Having to kill one of her would be difficult enough, but killing five of them at the same time and pretty much having to do it in one attack (unless you can somehow stop her from using that sword's powers)? The ability itself is powerful but can be overcome, the problem is when you combine that...
Rei's decision concerning the monster was decided from the start. Magic stone from a rare, powerful monster and a chance to quickly qualify for the Rank Up Exam. Not much to think about for him really.