In Curse Of Strahd, the winery was overrun by Blights and forest-folk. Davian took the rest of his family to the woods beyond the vineyard. There, they schemed for days until Pack arrived at Urwin's behest. Davian did not get along with or trust the strangers, but Adrian assisted them anyway, and the adventurers re-took the winery from the druids. Davian sheepishly rewarded the adventurers for their work with a diamond necklace he had possessed for most of his life.
Afterwards, they learned that the last of the three stones had been stolen by the druids of Yester Hill, intended to be made into an effigy to Strahd von Zarovich. Davian denied Adrian from volunteering and decided to accompany the party, as he ultimately felt responsible for losing the last of his family's treasure. As a unit, they destroyed the druidic conclave and felled Wintersplinter, and returned to the winery with the green gemstone in hand.