Talk to kraityn to decide if you want to help him

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DestructionDeluxe wrote:

i was in party and my friend kill him and i cannot talk to him and my quest now stuck what i can do

Can you try creating a new instance of the area?
To do this, click on a waypoint and then ctrl+click on the area and then click "New", this should create a new instance of the area and you should be able to talk to him.
You can also do this by ctrl+clicking on the entrance to the area.