ok new keys there are 3 keys hate,terror,and distruction you get all 3 tree from counetss(hate) summoner(terrror)and nithalk or how ever you spell it (distruction key)
you get all three and transmute them in act 5 hell youll fight super izzual drops mephistos brain then you get all 3 keys agin then you figth super duriel he drops baals eye then you get all 3 agin and then you fight lithith which is andariels sister she drops diablos horn then you trans mute those and you fight mephisto baal and diablo there all super tuff but if you beat them you get the ne wunique large charm