Liang explained how his true Spirit worked, however, Nitra, Osvald, and the Guardians were still puzzled.
Spirits were needed for Axalts to absorb energy, it lengthened the process considerably, but the output was the purest energy possible, which had a positive effect on their progress.
If an Axalt had a destroyed Spirit, his journey was almost over as it became almost impossible to absorb energy. Axalt could still do it like any other creature, but it would seriously pollute his body.
Axalts as a race were used to their energy being pure and unadulterated, much better than other races. It was a trait they had acquired over thousands of years of existence, so in this case, they had two options.
Axalt could try to restore their Spirit or they could end their journey and live as a normal person. This was possible to do, but it was extremely difficult and required a huge amount of resources.