Warhammer - The End Times - Vermintide: Drachenfels (Fatshark)
Vermintide is a co-operative, action, first-person shooter and melee combat adventure set in The End Times of the Warhammer Fantasy world created by Fatshark. It starts from the city of Ubersreik. Vermintide is interesting game using nicely background info. The latest update is one of the most iconic places in the Warhammer Fantasy - the dreaded Castle Drachenfels.
See more information from the official site: Vermintide and even more from the Drachenfels.
For background info see also Lexicanum: Constant Drachenfels