'How do I control the essence of the Heaven Devouring Abyss?' Tang Yin questioned himself. He was not sure how to control the essence, he had only controlled Abyss Qi before. Therefore, he had to experiment with the Heaven Devouring Abyss.
Tang Yin manifested the Martial Spirit, a black vortex enveloped by black and red lightning shrouded the cave. He then commanded the Martial Spirit to surge into him.
Tang Yin cut off the flow of the Heaven Devouring Abyss when a little bit of it entered his body. Then he tried to condense the part of the Heaven Devouring Abyss which had entered his body.
To his surprise, the Heaven Devouring Abyss actually compressed and started to condense. Tang Yin knew the essence of the Heaven Devouring Abyss was itself, this was exactly what it meant.
In other words, the Heaven Devouring Abyss was what the Heaven Devouring Abyssal Sanskrit was referring to when it talked about the essence of the Heaven Devouring Abyss.