This specific page presumably contains the spell Starswirl used to banish the Pony of Shadows to limbo.
According to Starlight, at least part of this reads:
"Hearg sylfum se Ponehenge. Toward dol grimlic of Fola Firgenbeorg, User endemest scield.", translated to:
"The temple of Ponehenge. At the base of Foal Mountain, our last stand."
not provided yet