Scales at least to 2-C (lowball), or likely Low 1-C (considering RahXephons are beings who can wander outside and beyond "numerous" regular spacetimes and create / tune them ), possibly 1-A because plot / story transcendence can be argued (reset the whole story, un-did the dimensional isolation of Tokyo Jupiter as well as the invasion from another dimension , by singing ).
There was at least one additional timeline in Toyko Jupiter, and parallel dimensions like that from where the Mulians came.
RahXephon is a type of God / eternal being, who can wander, tune and harmonize numerous worlds.
Scales at least to 2-C (lowball), or likely Low 1-C (considering RahXephons are beings who can wander outside and beyond "numerous" regular spacetimes and create / tune them ), possibly 1-A because plot / story transcendence can be argued (reset the whole story, un-did the dimensional isolation of Tokyo Jupiter as well as the invasion from another dimension , by singing ).