Immortal Barons is a turn-based strategy game for the terminal. You rule a barony in a ruined, post-apocalyptic world. You buy land, feed your people, build an army, and fight rival empires. The goal is to have the highest net worth when the turns run out, or to conquer everyone else. Play it as a door on a BBS, over SSH on a server that offers it, or on your own machine. The game is written in Go. It is an independent remake, inspired by the 1990s BBS door game Barren Realms Elite, and is not affiliated with or endorsed by its authors. Two programs are installed in /usr/games: immortal-barons, the game itself, and barons-ftn, an optional helper that moves inter-BBS packets over FidoNet transport. A board that does not join a league needs only the game. Requires google-go-lang from SlackBuilds.org. Stock Slackware's /usr/bin/go is gccgo, which builds the Go 1.16 language and cannot compile this; the build script uses google-go-lang's toolchain instead, whether or not the shell has read /etc/profile.d/go.sh. The source archive is upstream's vendored release tarball, so the build downloads nothing. Sysops: the game keeps its world in a data directory of its own choosing (-data, default ./data), and the BBS points it at a dropfile. See docs/door-setup.md in the package's doc directory for the door configuration, and docs/inter-bbs.md for joining a league. Build options: TEST=yes Run the Go test suite during the build and save the results into the package's doc directory as test_results.txt. Default: no.