This game is called project of debuffs...

That's why, (light) sol, (fire) ama, (dark) amon, (water)Cthulhu+dragon king are so important for endgame.

I donno whether the english version fixes it or not. It was possible to reduce boss attack over 100%, so that the boss didn't deal dmg, instead it heals with its attack. That's the reason why sol was godlike.

right now max. 50% attack down and 50% defense down. sol is still good but not that broken.

If u are aiming for endgame content, solo v70 boss etc. U should start with an account possessing one of those chars at least. amon, sol and ama.