In A Stygian Gambit, Ellenor got back into contact with Nessa and convinced her to join the Golden Vault as a contact of Meera Raheer. The gnome was contacted by animal messenger alongside Rasmus O'Dranith, Leilatha Vencaryn, and Ellenor herself to meet with Duplicity Kye at the Brine Widow. They accepted her charge to rob the Afterlife Casino, as its Unknown proprietor Quentin Togglepocket Whee Quickweasel Witt had betrayed her and stolen her previous winnings. The thieves were given Gildur's Map and told to re-acquire her 5000 gold as well as an Erinyes statuette, the grand prize of Quentin's "Grand Minauros Invitational" tournament.
When not playing games and gambling, Nessa procured information around the casino, especially from the bartender Libation. She then made marks with Ellenor, and the half-elf used feminine wiles to distract Thrill while Nessa stole his keycard. The gang uncovered Quentin's hidden Spined Devil guards, the Minotaur Skeleton guarding the vault, and the layout of the casinos Magic Mirrors: they had all the information they needed for a great plan.
On the day of the heist, Nessa was supposed to wait for Leila and Rasmus to let her in to the employee-only area, but Libation caught wind of her plan. She revealed the truth, and cut the bartended in on the deal, which ended up helpful as he ensured no new employees entered the backrooms. Eventually, she was let in, and robbed Quentin's office, then used his staff to control the Minotaur Skeleton guarding the casino vault.
After plundering the vault for items and gold, she and Leila made their way to the tournament, where Ellenor scoped out the statuette's casing. Leila played "sick" by spewing spores on the guards and Quentin during Anaïs Bellefleur's championship game. Nessa used the distraction to pick the lock and replace the statuette with a gold gnomish dildo. Amidst fog clouds and illusions, the thieves scaled down the Unknown's waterfall, and coordinated with Duplicity to pick them up via rowboat.
They sailed off into the Shifting Blue, having successfully robbed the Afterlife.