In Search For The Silver Dragon, Marcus finally got his chance to return to Strahd, nearly two decades since he had been wayshadowed. The legendary adventurer Tybus Steelborn was searching for the information on the Hideout, and put the Devilborn warlock Mormeros Fayan in charge of assembling a team. By luck, Tybus recommended that Mormeros search for capable fighters in the Ruckus Ring, and he attended a match between Marcus and a Minotaur. An obvious mark for Tobias and Ajuni's scams, they swiped his money, only to get unwittingly invited to join him on the quest.
They defeated orc bandits lead by Marcus's former rival Xuk Smashmouth and headed on a two-weeks journey through the Isilet Ranges and the Crowncrest Mountains. Following fairly useless maps given by Tybus, they avoided death by avalanche, Remorhaz, and the cold expanse of the Everglass to finally find Giantsbane. From there, they descended into the Underdark and met Queez and Ploom, who guided them to the Lake of Acid and its doors leading to the Silver Dragon's Hideout.
They narrowly made it beyond the lake after fighting off Hook Horrors, though Ploom was killed by a Cave Fisher. Marcus' strength was necessary to jump across the bridges and scout, and he just barely fought off a pack of Intellect Devourers before they flew across. They found the trapped Hideout beyond a set of Draconic doors, built into mountainside and guarded by Winter Wolves, but Mormeros tricked their leader Nihima into letting them enter. The hideout's arcane walls seemed to respond to Marcus and Ajuni's human blood, and they were granted entry.
In the hideout, a thought-detecting trap declared that a "Devil" was in the heart of the group, and would look to betray them. Mormeros proved to be an untrustworthy tiefling, so Ajuni and Tobias suspected him, and they narrowly avoided death by a Thaluud that had been trapped in with them. As they solved the mystery of the dungeon, they found letters from Captain Vladimir Horngaard and his steward Godfrey Gwilym, Irsel Rill Lakerun Gembop Geoheart's body, and her Dragon Scale Mail. With a last run, they temporarily trapped the Thaluud and stole the Dragon Slayer attached to its ankle, using Queez as bait to get out.
They ran downstairs, and found an avatar of the ancient Silver Dragon Argynvost sleeping, guarding a mass of silver coins. Next to him were two teleportation circles, and the waking dragon asked the party to go to Barovia and learn what happened to his manse, Argynvostholt. The teleport failed, however, and they were trapped within suffocating fog in liminal whiteness. Marcus was seemingly unaffected as the group choked, and the shadowy Vampyr approached.
Marcus' demeanor changed, as he recognized its shape, and he broke down in front of the figure, believing it to be Strahd von Zarovich. Vampyr, referring to Marcus as "Zandros", thanked him for the three worthy souls, and they left the space. Mormeros, Tobias, and Ajuni were left to die on a high snowy mountainside.