ages ago wasnt there a thing about calliope telling roxy her name and something about if someone says one of the cherubs names, one would immediately fall asleep and the other would wake up? was that a thing which ever became relevant in the comic?

Yes that was a thing but since Calliope is dead it won’t work on Caliborn. After Caliborn entered Roxy messaged him trying to do that but he didn’t read it.