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...
*The monster weaves a strange magic, the purple threads of the spell like intricate tapestry.
Little purple dragon belongs to @uminigai
Alphecca (hooded monster) belongs to @the-kursed