I promise, I will cut your puppet strings.— Lachan
Hahaha... But how will you cut your own? — 'The Marionette' of Apollyon
Shi Who Is Not There refers to an unknown entity which supposedly exists outside of the seven seals or 'laws' of existence. According to Apollyon this mysterious 'Shi' is the factor of his torment, and his punishment for reaching too far.
'Shi' despite being all powerful within the far realms can not breach the seals that were in place to make the Garden, and apparently wishes to collapse the greater 'Garden' by breaking the seals and casting the Garden back into the Far Realms.
I wanted so desperately to be free of death. I did not realize the nightmare that it was, in reality. It was not made for me. Please.. Please. I beg of you to stop me. Please. I'm sorry.— 'The Marionette' of Apollyon
The Will of Shi, also known as the Shi God, Shi Who Is Not There, God of Shi or simply as God, is a mysterious entity in the scope of known reality that serves as potentially a Supreme God(?), creator and leader of all the Far Realm's forces of nature in reality and beyond all creation itself, serving as a overarching antagonist of the Garden and all its related instances as a whole. For what reason does this creature want to do these things is unkown, but it causes absolute insanity in its victims it touches.
Supposedly, 'Shi' exists, but doesn't. Everywhere but nowhere. That they are supposed to be sitting on a throne, but the throne lays vacant yet filled. That it is supposed to be gold, but it in fact isn't. That she is everywhere, yet we will never find her. That this 'throne' exists, but it doesn't. It is hard to devolve meaning out of the Marionettes ramblings, but after the {ONISM} party secured the Marionette rather than sacrificing it, it provided insight that this thing is his 'master'.
When questioned to whether or not this 'Shi' was controlling Apollyon, the marionette admitted that it did not know anymore, and that all of it's existence is a blur of endless torment as he is forced to experience everything that has ever existed, that it wishes to die, but it knows what lingers beyond and it desperately wishes to save itself from there, and that it finds reprieve in looking at The Fated Fool, but those precious moments were fast fleeting before madness took it again.
