I recreated an arena from Pit People! Starting with a reference screenshot and Pit People promo images, I designed the colosseum and modeled a bunch of hexagonal modular components. They're exported and then assembled in UE4. Some shaders were written for fun effects (toon outline, lava, audience bouncing, decals, slight texture/geometry randomization). Ambient particle effects were also added to the lava. Finally, the video was composed and rendered with Unreal's sequencer.
Rock texture was based on: https://share.allegorithmic.com/libraries/1002
Grass texture was based on: https://share.allegorithmic.com/libraries/44
Pit People by The Behemoth: https://pitpeople.com/