Frostgrave
Frostgrave is a dungeon crawl/wargame first published in 2015 by Osprey Games. The setting takes place in the titular frozen city of Frostgrave, which has recently been unthawed after being frozen for a thousand years. Naturally, ambitious spell-users of differing stripes have come to Frostgrave in search of ancient knowledge/treasure/magical artifacts. To do so, they must contend with the many strange creatures and denizens left behind in the ancient city, while competing or working with eachother. The game launched its second edition back in 2020 and has since released several expansions and supplementary material. If Dungeons and Dragons and Warhammer had a baby, it would be Frostgrave.
Setting
Thousands of years ago, there was a great city called Felstad which sat at the center of a magical empire. Like Alexandria before Caesar, or Bagdhad before the mongols, the city was considered a center for learning and culture. Unfortunately, like those forementioned cities, Felstad would suffer a terrible cataclysm in the form of an epic blizzard that buried it whole and turned the surrounding area into a frozen wasteland. No one is quite sure what caused this phenomenon, though it is strongly suspected that the storm originated from inside the city itself. Felstad faded into legend, until eventually the city began to thaw and it's remains were uncovered. Since then, the city has come to be known as Frostgrave and Wizards have started hiring out mercenaries and warbands to launch expeditions into the city to learn its secrets. Unfortunately, these bands are prone to competing with eachother, and that is on top of the many creatures/constructs/undead that already dwell within the ruins.
Beyond the above mentioned fluff, the setting is not very fleshed out and we do not much of the world beyond the events that take place inside Frostgrave. However it is heavily suggested that Frostgrave shares a universe with Ghost Archipelago, which is another Osprey Games property.