“Warhammer: Vermintide 2 is a passion project developed by Fatshark, a studio which was formed ten years ago in Stockholm, Sweden. Over the years, Fatshark has built a solid foundation in the online multiplayer genre. Many of the core team members first met through tabletop gaming and it was during these late nights playing Warhammer Fantasy Battles and Warhammer Fantasy Roleplay that the foundation of the Vermintide franchise was formed.” Xbox Wire says
Source: N4G PC How Developer Fatshark Created Their Passion Project in Vermintide 2