The World Tree is not a tree, but a structure: an information network linking the land of the dead and the land of the living. Its trunk is the embodiment of "choice" itself. The black dragon Nidhogg gnaws at its roots, consuming not matter, but "possibilities that were never chosen." The contract between Lu Mingfei and Lu Mingze is, in essence, the accumulation and expenditure of these "possibilities." Every time they delay using a deal, they help keep the World Tree standing; every deal they complete hastens the arrival of Ragnarok.
