Naerlus went to infiltrate Candlekeep. He killed and replaced the monk Andannas Dalkur.
In 1487 DR, after receiving a pass-phrase, he killed a person but was uncovered by Elminster Aumar, also disguised as Dalkur. Elminster interrogated him but with little success. Soon after, Naerlus managed to free himself and tried to kill the Old Mage but instead he died.