[Masamune·1600]

It might be possible for other job classes to survive Tidal Wave at Level 99. I only did the calculations for Monk because it was the class with the highest Vitality bonus (the stat crucial to HP determination). However, I doubt that the magical classes will have sufficient Vitality to build up the HP high enough. If I do any additional calculations, I'll let you know, but they're extremely easy to do if you want to do them yourself.

As to Shinryuu, I would also advise you to be wary of Blizzard, which can take off around 2500-5500 HP on all. That could be problematic in mid-battle if you're working with less than full HP.

As to your other challenge: One of the things I find most horrifying about Omega is the possibility of Encircle being used multiple times. I don't know if how many times Omega can use the technique in a protracted battle, but if he can use it more than once, that's very bad.

Anyway, continued good luck with the project. Keep updating!

EDIT: I like the idea of throwing Dragon Lances at Shinryuu. Hope it works, if it eventually comes to that.