Oh look, another "make anything from nothing" mod.
This mod introduces the arcane art of voidcraft, which is a fancy way of saying you can create stuff out of thin air. This is powerful, but not (exactly) a cheat: this mysterious art consumes quite a lot of energy, and the inherent chaos involved in drawing upon such forces means that you're almost always going to have to deal with randomness before you can get useful products. The mod also adds new science packs and its own separate little tech tree for you to research using them, gaining access to new recipes, as well as intermediate products you can feed into the rest of your factory to keep expanding your voidcraft empire. You can optionally voidcraft the regular (and Space Age) science packs, but this is disabled by default.
You don't have to completely rely on voidcrafting, and mixing in some traditional infrastructure can help your factory grow. This is an intentional design choice to maintain balance and keep the gameplay interesting. If you want a game where you have no resources at all except what you're capable of producing with voidcraft, you might want to try Void Block.
The mod supports both vanilla and Space Age, although the endgame tech tree is quite a bit more sparse without Space Age content. Balance and recipes are still being tuned, as well, of course. You can add this mod to an existing game, but make a backup first because I'm not quite sure how well it'll all fit together.
If you like this mod and you also want some more nuclear mechanics (and pretty blue plutonium!) you might also like Bluetonium, and if you don't want the things you conjure to spoil, you might like Frozen Food.