Wait, what the hell?
Overlord is a custom game mode that uses CTF maps (but TeamGame game mode) that is almost as entertaining to watching play itself as it is to play.
Each team has an invisible base rather than a flag the spawns a Cacodemon and then proceeds to spew out Imps that hunt down the other teams' Cacodemons. What you end up with is an army of imps trying to breach into opposing bases to smack down a single enemy. Thankfully, the Cacodemons have a bunch of health. However, the imps will constantly fire if they get a lock on a target, meaning a crowd of them will easily bring down anything.
That's where you come in. The armies of Imps will trade blows with each other, one side winning eventually if no interference arises. You're the interference. You can opt to babysit your team's Caco-which has no survival skills, and will eagerly fly into the enemy base if unhindered-, disrupt the opposite Imp armies while push your own, or just hunt down the other teams' Cacodemons with a shotgun in hand.
So, this works on any CTF mapset?
Pretty much! However, flat, straight maps are preferred; more complicated ones tend to confuse the imps, causing them all to get stuck in one place. Of course, if everyone goes on the offensive, this doesn't matter.
Other teams? You mean, this supports more than two?
Yep! Nothing really changes; the person who gets the last hit on a Caco scores for his team. And yes, the Imps and Cacos can score for their team. Sometimes, they'll get all the points!
So where do I get this?
Spoiler: Changelog (Open)
Spoiler: Credits (Open)