Methods to obtain space debris include completing missions to obtain 5 fragments, using the Ascension Tarot Card to collect fragments on maps with many monsters, and obtaining a large number of fragments through space expeditions.
Complete the task :
There is a mission that will directly give you 5 space fragments , so that you can start a holy war. Fighting a circle of fragments in the holy war is enough for you to obtain fragments of all colors.
Use the Ascension Tarot Cards :
In maps where there are many monsters such as purification, hunting, and assassination, use methods to increase the drop rate of Tarot cards. Usually the big monsters will drop space debris.
In addition, you can also obtain space debris through space expeditions. You can get a lot of debris even if you don't travel the entire map.