Plaguefated Keep is an infection map forged by sirjosh10, SpartanNick 198, and an honorable mention for XGO ARTFUL.
It is based off of a Keep that became cursed and infected came about. It has a few holdout points on the map, a few weapons spread around it and some nice places to looks at.
There also is an easter egg on the map that you can find if you manage to get the sniper rifle and head to the top of the map, it is there to very subtly explain what happened to the keep.
PS: A few things may be added to the mpa like more cover or changes on weapon locations so be wary.