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 walls of Clifftown stretch before you, a little worse for wear and damaged but maintained. The monsters here are more tense, though they seem to go about their lives in spite of the overhead bombardment.