Infinite Fighting

You have a Limited Space, where you can store the essences of your fighting skills and release them for use when needed. You can also synthesize a certain number of same-level fighting skill essences into a complete fighting skill crystal or a higher-level fighting skill crystal. ... After Zhang Ji transmigrated into this fighting game world, the most precious lesson he learned was that only by fighting can you get everything you want. — Description from novelcodex.org