If you think that you don't have good armor and equipment to play this stage, you don't have to worry about it.
There will be a strong curse for all players who enter the stage, there will be stat limits.
For this reason, team work is the key to success. When you orginize the party, each class's Lv. 75 skill will become a critical factor for these stages.
And one tip for you guys, there will be big surprise at the beginning of the stage!