Authors note: this is just for people who really "really" care about this sort of thing so if this does not really apply to you or your interests then ignore it (but there are people who ponder this stuff so be considerate)
Rule 63 is the rule if you do not know "for every given male character there is a female version on that character" basically it also works inversely but in the story since we know that there are more than one dimension, dimension 63 is the one that applies to this rule, so in this world everyone character is gender-swapped (I.e. Xeon is female, Crystal turns male you know the usual jazz)
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The Encyclopedia
NonfiksiThis is an info book for all things the story related it has info on specific characters, events, species you know normal encyclopedia stuff