Bring the popcorn and let them fight it out

I cast Mend Buttcrack

But they also have the Unseen University

saves bookmark inconspicuously

Elder Scrolls Online has a first person mode, for what it's worth

Yeah, unfortunately, I can't think of the same type of game in true first person 3D. Maybe, Satisfactory (for building vast structures and automating) or 7 Days to Die (for the survival aspect).

Unrelated, but have you by chance played the Talos Principle games? Those are my favourite first person puzzle games, on the level of Portal and Portal 2.

Now that is a mood and a half

From my experience, Valheim is pretty close to Terraria in the general feeling of progression and exploration. While being a 3D game, albeit with a third-person camera

Minecraft is primarily a sandbox game with RPG elements, and Terraria is primarily an RPG with sandbox elements

If you want some radioactive shit, apparently there existed radium blankets, that would warm you up

Sounds like something that would be in Pratchett's Discworld, somewhere

Following the people from another comment thread - oligarchs. It might sound post-Soviet and old-fashioned to some, but it is a rather apt description - the power of few, if you translate literally