Leviathan Normal And Hard Required.

So we have to beat Leviathan in both Normal and Hard Mode to progress through Main Storyline....

I don't know what to say.

Uh, no, it's hard (regular) for story and the extreme, you don't need to do extreme to finish the story.

You'll be alright. Save complaints for after if Leviathan's AOE/Insta-Kill/Lag is anything like Titan's. With people able to get Turn 1-5 on farm on top of myth the HM and EXs won't be that bad from a damage and HP stand point. If they adjust fights to 6-9 (ilvl 100? ilvl 110?) then sure but no way Leviathan EX is that high.

There is no normal Leviathan, it's HM leviathan for the story quest ( easy fight ) and EX leviathan ( you're going to get rape fight ) for good items.