Hmm, shouldn't be too hard. Already had some ideas.
Spoiler
Ryan: Needs to strike a deal with Pel to get information where he can find an old friend, who is hold captive from the heroes for half a year already. The fortress is well guarded and it will be hard for him to manage an infiltration. (Ryan's friend would be one of my creatures after the mission, if that would be ok)
Pel: Aids Ryan for money. He wants 10.000 gold and gives him the information then. He follows him into he fortress to capture one of the heroes himself and torture that guy for information then. After that he will set the guards off, so Ryan may get caught. After he gets the information he wants from his captive, he'll leave the realm for the possibility that Ryan could've made it out of there alive.
Verack: He wants to destroy an old graveyard, where dozens of skeletons serve one powerful vampire. It's kinda a revenge mission, though it will be an important part of his character devolvement. He'll also get something back, something he lost years ago...