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.
Could you make the production buildings make the alternate ammo types for krastorio 2?
Krastorio compatibility is something I'd like to add at some point but it's a pretty big job so I'm not going to promise anything anytime soon.