Rasmus's first adventures occurred in the Murkmire Malevolence, when he was contacted by Meera Raheer of the Golden Vault for a mission that got called off. He joined a group alongside Matthew the Ascended, Margaret Pearl, Ellenor Breatham, and Leilatha Vencaryn, growing quite close with the team. After spending a few weeks trying to gain favor with local nobles, he was called to action alongside the group.
They were tasked with returning the Murkmire Stone, secretly an egg containing a vicious creature, to Doctor Cassee Dannel. 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." Rasmus's charisma proved extremely useful in the success of the mission, talking his way into and out of the right situations.
However, the heist did not go smoothly after a bust-up between Matthew and Caelas Helefir. Rasmus was exposed then knocked out by the guard Grendor Battleaxe, and had to charm Clarc Pendergilt-Vanth to kill Grendor. He seized a moment of chaos after learning a secret from Doctor Horthnar Stonecrusher, releasing an Allosaurus Skeleton throughout the museum to cover their getaway.
These "big plays" delighted Mikahbu, and their mission was ultimately successful; they stole the Murkmire Stone and capture it in crystal before it hatched. As a reward, Rasmus was gifted a set of Eyes of Charming, allowing him to better make use of his manipulative magic.