You see folks, this is why April Fools' Day is dangerous. Or awesome. Delete depending on your affinity for zombies. Back in the dark ages of seven and a bit months ago, Paradox Interactive released a teaser for a fictional Crusader Kings Z, a game that hypothetically merged zombie invasions with medieval European strategy. Months later, and that joke is now a real thing that you can play in Crusader Kings 2. Thanks mods!
For those who've played Sunset Invasion, Paradox's own alternate history add-on, Crusader Kings Z follows a similar pattern. At some point past the year 1000 AD, an event will trigger that unleashes a zombie horde in Ethiopia. From there they build in strength and numbers, spreading from Africa to Europe. It's your job to build a big enough army to stop them, all while stopping your dick half-brother from poisoning you. Just because there are zombies, that's no reason for regal intrigue to cease.
It's a small but enjoyable mod, with an understandably significant impact on campaigns. You can download Crusader Kings Z from here, although you'll need a Paradox forum account to access the page.
Crusader Kings 2 mod brings zombies to the middle ages
Source: PC Gamer (opens in a new tab)