Fort Mercer undead nightmare
This map will make Fort Mercer look like a surviving base
You need to have the Map editor : https://www.rdr2mod.com/rdr2-map-editor-v0-1-6-1/
And I recommend you to use the following mods:
rampage trainer: Rampage Trainer at Red Dead Redemption 2 Nexus – Mods and community
gopro_2027’s Playground(i use to spanw zombies): (Source Released) gopro_2027’s Playground (Controller Support – Driveable UFO – Predator Missile – Zombies – Gravity Gun – Force) at Red Dead Redemption 2 Nexus – Mods and community
rdr1 undead nightmare soundtrack: https: Red Dead Redemption Undead Nightmare SoundTrack at Red Dead Redemption 2 Nexus – Mods and community