I used to be really big into Fortnite, and, honestly, I think a Fortnitemares scare zone could work. In 2018, they added these rock structures all over the map, and the rocks would keep zombies spawning all around you until you destroyed them. They had some good Halloween skins too, like a zombie version of the mascot of the game, a ghost cowboy, and a headless horseman looking character to name a few. I honestly think it could end up being kinda cool if they went this route ngl.