I’ve been playing a decent amount of Dwarf Fortress lately.

I sealed a bronze colossus into my fort after it killed 20 or so dwarves.

Fun story: while I was walling him in, a dwarf child wandered in just as the last of the bricks sealed him in. Eventually the colossus sniffed him out and they fought. The colossus threw a punch and knocked him through the arrow slits, saving his life.