I got the quest from Madras to kill the Rattkin breeders. Searching the sixth bough for roughly 2 hours ( and it´s not THAT large =) ), but finding no breeders, only this Calzone guy and some inaccessible doors, I decided to look things up at the board. There I learned that I need some Rattkin key to open one of the doors which leads to the breeders. And this key is owned by the Don, who I know is behind Calzone, but Calzone won´t let me pass without some Keyword. How does this normally work out? Who´s supposed to tell me the word I have to tell Calzone? Should I have completed the Rattus Rattus quest first? Or does Calzone own the Key and I have to pickpocket it from him?

When Calzone asks who/what you're looking for, you can answer either "dark savant" or "astral dominae". That gets you in to see the Don.

The key, however, is an another room inside there, just sitting in the open, waiting for you to take it. Do some exploring after you talk to Barlone.

<center>Nightowl2</center>

Nightowl is correct, and just to point out, you needed to be given the answer on that, because I don't believe you can find Rattus Rattus again to ask him what to tell Milano. My very first time through, I spent WAY too much time in the Trynton Arnika Road with no luck... only armies of Juggernauts.

Calzone will take you down the hall to the right to meet the Don. The key is down the hall (behind Calzone) to the left. You can't miss the key. You may want to save your game before using the key to open the breeders' door - it may take a couple of tries to satisfactorily beat the breeders. Just don't let them two-team you.