Kromed trial instance

then i want to ask again abaout kormede trial instance..
i was trying to get corrupt judge hat that will be droped by shadow judge kaliga..
it is a end boss of this instance.. but the end game boss always kaliga the unjust and i kill him 3 times but only corrupt judge leather belt i get outy:

and how to enter instance with hard mode or easy mode?

 

Kaliga don't drop Skins if you Kill only he, only drop Keys with low chance, you need Kill other 3 mini-boss, and this choice will change the drop and final, if you kill 3 mini-boss, will need kill the Kaliga and 3 mini-boss again in Kaliga's room, (chance to drop Corrupt Judge Items 4x in only 1 time)

 

is that a hidden door? wahh really i dont see that hah..
big thanks for you.. really helping so much

 

ru from lumiel?

 

wew was that intrace