AetherCraft, in short, is a mod about aether. What is aether, you may ask? Aether is the one material that makes up all objects you can see, the one thing that binds together all matter. Up until now, this material has only been existent in theory. Now, you have the tools to convert things to and from this ur-substance!
With the tools AetherCraft gives you, you can both convert items into pure Aether and turn Aether into items. You can even use Aether to charge items of great power!