Not a big episode in the life of sisters. After Elsa gave birth to a goblin, the humans found out that the sisters had sex with monsters (watch the previous episode "Unplanned bastard"). As punishment, they were exiled to the capital's sewers, where a new kingdom awaited them, the kingdom of the ratmen.
Link
https://mega.nz/file/6lFXmQCJ#53PlLGsyCoAodDKmBC5OsXdNaVrhtyr0CdGoMBFJNHw