In Curse Of Strahd, Jarmo was having a regular day of studying, cooking, and carpentry until he was central to a prophecy made by the archdruid Ylyana the Starseer. Alongside Shakti, and was sent to "fulfill his destiny" in the mists northeast of the Astralwood. Ghalwin secretly joined the two, and they accidentally wandered through the Vanishing Grove into the dread realm of Barovia, where souls could never return.
They quickly came into contact with the Vampire lord Strahd von Zarovich, who nearly killed them all before Jarmo successfully begged for their lives in exchange for being bitten. Swearing to defeat Strahd and return to their homeland, the group began calling themselves The Pack after adopting a stray Dog named Lancelot. They were accompanied by the noblewoman Ireena Kolyana, who Strahd obsessed over, and looked to bring her to safety from the Village of Barovia. Though Ireena could be obstinant and somewhat childish, Jarmo took a quick liking to her, and she responded in kind; the two fell in love during their travels.
At Tser Pool, he underwent a Tarokka Deck reading that told him vague descriptions of items and allies that would be needed to defeat Strahd. In this reading, he learned that an answer to his curse could be found in the Abbey of Saint Markovia. Adventuring through this land lead to many hardships for Jarmo, who narrowly avoided several near-death experiences as he made his way to Vallaki. Once in the town, he found out the identity of the famed monster hunter Rudolph van Richten, a fated ally indicated in their prophecy. The Pack assisted in saving Saint Andral's Orphanage from a deceitful Shadow Demon, learned the secrets of the Keepers of the Feather, and became an ally of the noble Vallakovich and Wachter families.
van Richten joined them in a quest to find the bones of Lugdana Andral, as their removal from Saint Andral's Church had unconsecrated the land. This investigation hastened an insidious plot already in motion, ending with Vampire Spawn tearing through the streets of Vallaki and the arrival of Strahd within the Vallaki Town Square. Strahd had been watching Jarmo, and was incensed that he "betrayed" him by courting Ireena.
The vampire lord charmed Jarmo and Ireena while Ghalwin and Shakti were busy dealing with vampire spawn on the other side of the square. He kidnapped her atop his Nightmare Beucephalus before removing Jarmo's Dreamweave Circlet. Both his best friends were forced to watch as Jarmo slowly turned to stone, finally succumbing to the curse of his family. His body remained in the square, petrified, until Ghalwin took his stone body to the altar below Saint Andral's Church.