This thread got approved a little bit too late but maybe you can use it next year?
And for other similar quests!
This may and may not be seen as a scam but dont whine about that in replies!
You can only summon Coren Direbrew once a day by yourself thats why some people (like myself) tries to get more then one group without having to summon him.
This is one of the ways they might use:
They get a nice group and go to BRD.
Then they pick up the daily quest.
Then they make make sure that they dont have to summon until everyone or everyone but one has.
When your group summon him for the third time they abandon the quest.
In all the confusion you will think that you killed him four times and let the last player summon him.
How to avoid:
Make sure that everyone have the quest before starting and then count and memorise who that did allready summoned him!
Remember! MMOwned do not condone scamming!
//Willy t3h whale