Found in Rithwic:

Royal Guard Gabrielle tells you, "Hail, friend. High Queen Elysa has asked me to keep citizens informed of increased Renegade activity. I've been informed, only recently, that there has been some activity amongst the Renegades in the Direlands Swamp. In fact, the rumors that I've received place the activity in a complex not far from where that strange portal found in the Blackmire Temple sends you. If you have the desire, please look into this for us."
Royal Guard Gabrielle tells you, "They must be stopped at all costs. Please, hurry there and stop them from assisting and meeting the Burun."