This was way back in the day
Well it seemed that those Red Dragons would always use some kind of breath attack the moment I started fighting them. It hit for like 9999 damage for all my characters. Now and days I don't have a problem with this much as breath bearly hurts or heals.
Also getting to Omega was a bit of a challenge. I remember when I first for the ragnorak I seen the island and I was like whoa just like the KOTR island in FF7. finds out you can get the most powerful summon there too.
Now as for most FF's Marlboro can completely destroy you. Bad breath is the nastiest thing square enix could think of. the funny thing about it is in most rpg's after I learn it as an enemy skill I rarely use it even though it is a very deadly attack.
I think though after a good long time playing a ff, no enemy is that powerful and can be easily destroyed by lion heart or other great attacks. Griever...
somthing about level 100 that sucks
L5 death + level 100 = game over
Once you get like 100% immunity to most status attacks and like 200% immunity to elementals you should have Ultima and Omega beaten. If your like me and try to fight them the moment you can. He can be somewhat hard.