I think Tharkold's death sports and arena combat stuff would be more on the brutal side of things, what with the demons and Russian setting and all.
Some Autoduel/Car Wars/Deathrace 2000 mayhem seems a natural fit, right?
If you're not familiar with Deathrace 2000, it features a dark satiric dystopian game show where a bunch of weirdos engage in a cross-country auto race where their vehicles are equipped a range of weapons and they score extra points for pedestrian kills. The movie's actually pretty fun in a trashy '70s B-Movie sort of way. Its had lots of imitators and homages in the years since, like Twisted Metal, Carmageddon, a shitty remake directed by Paul W S Anderson, etc, and I can definitely see the evil overlords of Tharkold running a similar race that crosses their cosm.
They might also have a motor racing venue akin to the sorts used for NASCAR, Indy 500, or demo derby events - though probably with some additional obstacles and terrain features to spice things up.