They go to the same place, between the Niche world and the Void. There is no distinction. Ghosts tend to fade away after some time.
They are the same genus, like horses and donkeys
The universe went boom
They don't speak English. They technically speak different languages but can understand each other since Niche is a "Tethered Node" (I just made that name up), which means they hear each other speaking their language
The aging happens overtime, with a growth spurt at the end of teenhood. Bodies become bones because a Niche day is a month for me. Nighttime passes quickly because everyone is asleep. Food just kinda happens, idk
CHIM /j
All pantheon gods are, in some way, true. The gods tend not to care for those who don't worship them or are unable to.
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Gems are kind of like teeth: they grow out when there is space for them to. They can't form before because there isn't space.