This is someone's tabletop RPG campaign setting built in Obsidian. They're running a sci-fi/fantasy mashup called "Arbiters of Fate" using Dungeon Crawl Classics rules. It's set in a dystopian multiverse called The Pancake where megacorps and magic clash. The site has player guides, creature lists, and world info for their group. They run games both in-person and online using Foundry VTT. Looks like they're in the middle of converting everything from Bunkers & Badasses to DCC.