So for my main multiverse , is named Hideverse (don't ask why). It started as a fgod till hidetale was create . After the ambush Error accidentaly teleported there. After the multiversal truce a sans (Gen) got transported in the anti-void. Gen is practically from ather mv ,where he is a geno but with a twist. Like , after 600 resets he goes insane and kill everyone and at the 1000 reset is the final blow, after killing everyone he ingect himself DETERMINATION . Then he have been locked in the save-screen for 100 years , then he have been transported in this mv.
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That's Gen. The necklace is from past Nightmare (when the accidend hasn't happend |is from Gen past mv), since that Nightmare have been transportated there (in save-screen) and lern how to make portals from dreamtale to save-screen. So they talk everyday , after 2 years Nightmare give Gen the necklace and Gen give him a moon clip . These from the arms are from Reaper. Reaper know Gen for 10 years when he meet Nightmare . And Gen a lil part of his scarf.