Possible idea for a harder gamemode.

Its just a basic concept but not very used I just remember right now a game that have something similar to it: Don’t starve.

but, if any time you decide to add aggressive NPCs (not talking about just wolves or bears) you could make some kind of “Pitch black” gamemode, where creatures attacks you harder on the night/dark areas if you don’t have light.

Its just a really basic idea, but I can imagine how interesting could be to focus on build and gathering on the daytime (with the usual PvP factor) while you try to defend yourself during the night.