I don't know if this still works, but:
There is a bug with instanced quests that end with you talking to the final boss, fighting them, then having a final conversation with them. If this conversation gives you a dark/light option at the end you can pick the option you want to end the conversation.
There is a bug with instanced quests that end with you talking to the final boss, fighting them, then having a final conversation with them. If this conversation gives you a dark/light option at the end you can pick the option you want to end the conversation.