Chaos Crystal Mod 1.7.10, 1.7.2 is a mod all about aspects. Those aspects are what makes up the existence of blocks and Items. Using a Chaos Crystal you can extract those aspects, store them and infuse them into other blocks or items. By extracting or infusing aspects you change the existence of these blocks - they will transform depending on the aspects that are added.
Using foci you can control which aspects the Chaos Crystal may use or decide wether it should use only blocks, only items or both - and you can control how far it can reach.
With the chaos machines you can harness these aspects in a more controlled manner, for example use it to create blocks and items from scratch or repair your tools.