Heaven-Grade Battle Spirit Arts were entirely different from ordinary Battle Spirit Arts. To raise a Battle Spirit Art to the Heaven Grade, one first needed a special seed capable of bearing the power of one's own laws. Yet among these seeds, the most important thing was the secret art.
The secret art's primary purpose was to completely condense the seed into form. If the seed could not take shape, it could not display any power. This was why, before a Heaven-Grade Battle Spirit Art truly reached the Heaven Grade, its might could actually fall short of an ordinary Battle Spirit Art. The stronger the seed, the greater the effect it could unleash after reaching the Spirit Venerable Realm.
However, these seeds also had potential limits. Many seeds could only reach a certain ceiling before they could no longer improve.
The seeds themselves had nothing whatsoever to do with spiritual power attributes. They did not require special spiritual power to cultivate. In theory, nearly every Heaven-Grade Battle Spirit Art could be cultivated by any Spirit Venerable expert. This was determined by the very nature of Heaven-Grade Battle Spirit Arts.
The problem was that even if some Heaven-Grade Battle Spirit Arts were cultivated, they might not suit one's own characteristics. Just like the later stages of the Shadow-Entanglement Secret Art—Huo Hai could force himself to cultivate it, but his Origin Essence was neither shadow-aspected nor dark-aspected. He simply could not bring out its effects. The sole concealment effect would likely be inferior even to his own abilities.
But this sword art was different. Huo Hai needed to analyze, bit by bit, the method of forming the fundamental seed. He could not do it by himself, but with the aid of the Starstone Wall, the process became extremely fast.
Even now, Huo Hai