Anyone that knows of a place where certain mobs drop a crazy amount of gil? Trying to find a place better than Omega Dungeon.

Buy tetra items from Kilika. Fight some of the creations in the monster arena and throw what they drop into these armors/weapons. Sell the customized items back for a sexy profit.

I dont have the super powerful weapons to do the arena monsters. Is there next best place I can do to get good gil beside Omega Dungeon?

There isn't really any place better than Omega Dungeon for finding gil. Especially if you have Gillionaire on one of your weapons, you can get the Mimics pretty often for an easy 50 or 100k gil. You might as well do Omega Dungeon and take the opportunity to get some nice experience while you do it, because by the time you get any real gil from other places you could have leveled and gotten as much gil from Omega Dungeon.

To put it simply, if you can do anything in the Monster Arena, that's your best shot. If you can't, Omega Dungeon's just about the best place you can go.

ahh forgot about the mimics ty