So I was farming ''From beyond the grave'' for my monster manual. At gate with hireling and dog on offensive mode, moving every 20 minutes and looking at the kill count.
It wasn't until 600 kills that I realised... I didn't had conquest yet.
Amused, I decided to look on DDO wiki if it said anything about conquest. Nothing. Not even for onslaught bonus.
At first, I was like: It must be impossible to get conquest in this quest! I mean if after more than 2 hours of intense zombie killing I did not had conquest it should be impossible.
BUT IT ISN'T!
The conquest bonus for this quest is between 800 and 875 kills.
Now I dare anybody to get this bonus on elite at level! :P