Ellenor's first adventure occurred in The Murkmire Malevolence, when she and Matthew were contacted by Meera Raheer of the Golden Vault for a mission that was ultimately called off. Adopting her former friend's name, "Dee", she joined the heist alongside Matthew, Rasmus O'Dranith, Leilatha Vencaryn, and Margaret Pearl. She grew quite close with the team; in a hallucinogenic episode at Glumfall's Luxury Tavern, the half-elf revealed her true name to the party, but kept her past secret.
After spending a few weeks killing time by busking and thieving, the group was called to action. They were tasked with returning the Murkmire Stone, secretly an egg containing a vicious creature, to Doctor Cassee Dannel, who Ellenor immediately began flirting with. During a gala at the Cliffsunder Museum of Natural History, they planned to steal the stone by cart, using a Draft Horse named Marx to carry it across town under the guise of "Cliffsunder Party Supplies."
After staking out the museum, Ellenor entered the gala by gossiping with the talkative Helene Danforth and sneaking Margaret in below her dress. The heist did not go smoothly after a bust-up between Matthew and Caelas Helefir, however. Ellenor fell multiple floors while dashing along a balcony, narrowly avoided death by Living Doll, and had to knock out a rival team of thieves, but somehow the crew still managed to steal the Murkmire Stone and capture it in crystal before it hatched.
After an ultimately successful heist, she and Cassee sealed the mission with a kiss; however, Matthew had fully disappeared from her life.