Finally beat every monster, now is the start to CG hunting. This game has some serious grinding issues if you want to farm mats for your equipment. Farming Abyssal Crystals is a pain so I only farmed enough Abyssal and Miasma crystals (10 miasma makes 1 abyssal) to get the best sword.
I even got to lv99 due to mat farming and at that point, the hidden boss is a joke, even in crisis. Rather, Crisis is only hard in the 1st dungeon when you don't have enough tools to fight so you have to get things right and grind a lot: Around lv8 (7 if you want to rely on your luck a lot, 8 if you want to gamble with a good hand and lv9 to get the AoE fire spell, I personally did it on lv8).
After that, the game becomes easier, especially once you unlock Weakening II (AoE poison, AoE sleep and AoE confuse can kill most bosses). Main story boss can be beaten at around lv55 in crysis, but is a hp wall.
The best "armor" is the gem that raises your evasion. Evasion is ridiculously good.
Best magic are healing, weakening and fire due to healing enagram giving heal and more efficient soul exchange and the DoT damage from fire and weakening which is baed on the target's max hp. It has a hard cap of 999, but is one cap per DoT (poison and burn takes 999 while the special burn takes 500).
Fire enagram also gives a passive Mat bonus.
The next good one is thunder since it gives you the speed passive to attack first, followed by Explosion enagram since it gives you more MP and MP regen.
I think you have to beat the last post-game dungeon (after the giant robot and trap dungeon) and then speak to Memoria to fight him
And I don't think so, 15 (lv1) corruption seems to be the lowest limit once you pass the threshold
Thanks, I didn't expected that it was that easy to unlock.
Also, my game version seems a bit bugged, after a lot of turns, that boss started to spam its charge skill without attacking.