this mod allows you to customize how many mobs spawn at night. after 20 nights the mobs will go back to normal. this is very helpful if you have a ton of mob mods and spawning is out of control this should help.
warning this mod is in beta expect things to not work.
this mod is not being worked on anymore for now but may get updates in the future if you want to have the feature tho
its in this mod right here Wilderness Odyssey API - Files - Minecraft Mods - CurseForge
