Battle of Decay is a multiplayer open world survival horror game. You are a survivor of a disease, something you never saw before (you can find it out by playing single- or mutliplayer). You have to survive against Monsters / Mutants and you are able to craft, build, fight with or against other players. Find ways and loot to survive and hidden places with secrets.
The open world map has several parts. Hills, Mountains, Forests, Rivers, the Sea and of course beaches.