The basic theory of formations was to create a special space by utilizing natural terrain, collaborating with Yin and Yang energy, and integrating with the five elements. Depending on specific environment and formation map used, this space could have offensive, defensive, facilitating, or restraining powers.
The patterns on the Seal of Patriarch Sa was in fact a miniature formation map that could seal off and protect an enclosed area. The formation map did not have a name, so Gu Yu gave it one as straightforward as his names always were—Small Sealing Formation.
Such a formation left behind by a celestial master was no trivial matter. In the several months of his seclusion, he had spent most of his time studying the formation. Even so, he was only able to comprehend a limited proportion. He was resolved to use what he'd learnt as the basis, and with some simplification, he came up with a makeshift formation.
