As the cure is being made, Castle Neverwinter is attacked by the minions of Desther, who betrays the heroes. Desther takes the completed cure and escapes the castle, with the hero and Fenthick in pursuit. When they catch up to Desther, he surrenders after a short battle. Desther is sentenced to burn at the stake, and Fenthick, despite being unaware of Desther's true intentions, is sentenced to hang. The protagonist meets up with Aribeth and Neverwinter's spymaster, Aarin Gend, to begin searching for the cult responsible for the plague and the attack on Neverwinter. The PC retrieves the diaries of dead cultists and letters from a person named Maugrim Korothir, which convince Aribeth that the cult's headquarters are in Luskan. Aribeth goes ahead to Luskan, and the hero follows after speaking once more to Gend.