To advance his cultivation, Tang Yin only needed to Devour Principles according to the Heaven Devouring Abyssal Sanskrit.
He could Devour Principles of various kinds, including Space Principles. The specific type of Principle he devoured didn't matter, as each one would contribute equally to his cultivation advancement.
The Space Principles at the Abyss Layer were quite abundant. Tang Yin did not have any problems with devouring the Space Principles for his cultivation base. He would at most halt the Abyss Firmament's expansion by a few weeks.
Tang Yin did not change his method of devouring or anything else. He continued to Devour Space Principles like usual.
However, instead of redirecting the Space Principles into the Abyss Firmament after devouring them with the Heaven Devouring Abyss, Tang Yin permanently devoured them to increase his cultivation base.
This could be likened to food and 2 houses.
