The day Monster kind was sealed into Mt. Ebott, the mages added a little extra insurance. A curse.
Human SOULS may pass. But Human forms may not.
Young Frisk must navigate the dangers under the mountain, a little less human than before...
Heehee! Glad ya like it!
The cameos are actually from a Monstersona contest I held back in June where participants would get their OCs as background characters in the comic. It has just taken more time than I realized it would for the story to reach Snowdin City.