I'm mad about something, and you should hear about it.

[BobbinT]

And this is bad why?

Diablos is a minor summon, mostly famous for FFVIII and a bit for FFXI too.

I see that you never play FFXI, hence making the remarks.

In XI, Diabolos are summon specialize in dark magics, which includes Death. He also known as some sort of Lord of the dream who creates the world called Dynamis, which is basically the what-if scenario when land of Vanadiel are in total ruin. Not something you can take lightly.