(Heartfelt thanks to 'I'll Definitely Get What I Want at the Next Grand Construction,' 'Mingyun de Ling,' 'World's End Ballad,' 'O0 Tear Wound 0o,' 'Tenkuu no Sensesu,' 'Lin Yu Xiao,' 'Yan Ai Ai,' 'Zhun Dong Man Zhai Yi Zhi,' 'One Rider, Ten Thousand Strong,' 'Zi Ye Xuan Xing,' and 'Long Lian Qingxue' for their tips!)
Although he did not know why the Great Sage Equal to Heaven had suddenly manifested, Noah more or less guessed some of the reasons from the conversation between Susanoo, the monk, the princess, and him.
For some reason, the Great Sage Equal to Heaven seemed to have been imprisoned by Susanoo, the monk, and the princess using some kind of spell binding in one of the spaces within the Netherworld.
That space was the one where the princess had used sorcery to reveal the Great Sage Equal to Heaven escaping from a palace, only to be cut apart by a black spatial rift.
Because Noah had used the Sword of Rupture (Ea), the space Susanoo occupied had been directly cleaved apart by that Treasure Tool capable of cutting open the world and creating heaven and earth.
At that moment, the wind pressure from the Sword of Rupture (Ea) happened to reach the space imprisoning the Great Sage Equal to Heaven.
After all, the Netherworld was a multidimensional world made up of many different spaces.
The fact that people here could teleport simply through imagination proved that these separated spaces were connected.
Thus, when Noah used the Sword of Rupture (Ea) to split open this space, he happened to open a path leading to the space where the Great Sage Equal to Heaven was imprisoned.
As a result, the wind pressure from the Sword of Rupture (Ea) also cleaved apart the space imprisoning the Great Sage