"In the language of your Xia Country, you could call it a 'Treasure Body.' It involves using Spiritual Power and attuned Elements to construct a relatively stable spiritual structure outside of the physical body. Only by forming a Treasure Body can one resist the corrosive storms in the depths of Subspace."
"My Treasure Body is called the Broken Gold Flowing Fire Body, which is a Fire Attribute Treasure Body."
"When your Soul Beasts reach the Emperor... no, the Monarch Limit, their understanding of the Elements reaches a very high stage. The ambient Elements in the Main World can no longer satisfy their needs. At that time, a Beast Master must leave their physical body and travel with their Soul Beasts to more primitive worlds to absorb higher-level energy."
"Your Spiritual Body can gather abundant Spiritual Energy for your Soul Beasts to absorb. As their strength increases, they can in turn nourish your physical body and spirit, creating a perfect feedback loop."
