The Dink Network

My dad beat Nihlathack and found one of the keys, so he asked someone else who played Diablo what it was. He told me about and I figured it was a new part of the game, so I went after the countess, The summoner, and nihlathack several times to find them. One thing that really bugs me about Diablo though, you can't hire an angel from Tyreal to help you beat up monsters. That would be cool.
P.S.
The first time I played Diablo to the end, I went in to Duriels chamber, and since no one in the town mentions him, I figured that I could just go in and get to act 3, but when I enter,
Duriel is coming right at me. The townspeople should say something about a giant bug.