Right that's it! I must be playing a different game!

[Hazzard]

Super Nova - Can kill, but many does deadly status ailments.

At least you agree it can kill, everyone else I spoke to (online) treat it like it's a "demi" type attack - i.e. it just lowers you HP if that makes sense. (bull?)

I thought that it did something like 15/16 of your max hp.

15/16...what do you mean? It killed one of my characters, cause it does like 3500-6000 HP damage, killed off Cloud, the others had status ailments or one of them had Ribbon equipped.

Ultima Weapon is the one which keeps flying around, finally defeated at Cosmo Canyon - Just west from it, opens a path to the Ancient's Forest.