S4, E4: Janapurna and the Stallions of Hokar

Note: I write these premises into stories that take place after Requiem. So this is a Season 4 episode. The Young Ones are summoned by a new ally on a mission that whisks them on an astral plane where things are heard but not seen. They must beat an old nemesis and tame the deadly stallions to break a spell and rescue a princess of the Realm. How will they do it?