Conjure items from nothingness using energy and a bit of magic. Or sufficiently advanced technology, who really knows?
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
New Ores and resources as well as machines.
Things related to oil and other fluids.
Furnaces, assembling machines, production chains.
How about ancient/void beacons that function similar to normal ones but maybe have less slots? Or maybe have even more slots (since the void buildings do kinda take a lot of energy and time)
Duplicate of https://mods.factorio.com/mod/Voidcraft/discussion/67647540128b11b9ff796a85