Take a look at what the master @Skaul has put together (link below). He has compiled a list of everything you want to know when you are starting the game. You can also go to the codex and then the legendex while you are in-game. Look at the character you are playing for where items drop and the conditions like nadroji. Nadroji drops from epic / epic plus monsters starting at floor 100 for amulet and ring. I think the armor/helm drops at floor 200+.