Three Tune Nine Pool Formation

Fang Yuan names it as the strongest Immortal Gu formation Chi Qu You has ever made. Chi Qu You is a formation path great grandmaster. Chi clan descendant Gu Immortals used this formation during the five regions chaotic war and killed many Central Continent Gu Immortals. Chi Qu You made it in his later years and is still far from dying at the time Fang Yuan says this. ^{ch. 1212}

Watching a different Southern Border super Gu formation over a giant dream realm, Fang Yuan reads overlapping formations inside formations as the style of three tune nine pool formation, and wonders whether he can deduce that formation from the one in front of him. ^{ch. 1212}