What can I do with the Fampyr?

So, I was recently in Raedric's Hold, fighting the master of that place once more. After defeating him, apparently proving that I'm a better Berath champion than he was a Fampyr proposed to give it's services to me. I agreed.

But now what? The only effect I can see is lowered Glided Vale reputation. I can not find it anywhere in my stronghold, it's not on the hireling list (like the Ogre I once recruited is). What happened? Is it a net-loss situation?

[edit 07.07.2016] On my new playthrough said Fampyr did not offer its services. Perhaps it was removed in some patch? If someone could confirm / find the relevant patch notes this question can probably be closed.

Solution 1:

The rep loss is unrelated to the poor Fampyr. It's triggered by a nasty bug, described here. Sadly, I have no clue what to do with the Fampyr... He disappeared in my case and I wasn't able to talk to him after the fight.

Solution 2:

Afaik you also need the quest 'Servant of Death' to be compleated (the order of quest does not matter - you can go back and speak to fampyr after both quests are compleated)