I just know about that one. Greg showed us where it is. There's probably other ones - at least Pride has to have one too. Both labels are doing the same kind of thing. If they had to guess, it's under the building, same as Virgo's. Frisk's mouth tugs down in a frown. Sans was the only person they were keeping there though. Because he's a monster, so his soul's not the same.

He could probably show us what color people's souls are, if that matters, they muse, hands moving a little slower. But he'd have to get in a fight with them. Maybe don't ask him to do that. Papyrus can do it too.