From the first page of the PDF:
Devious plots have greatly weakened the Seldarine and nearly destroyed Arvandor and the Demonweb. Can you intervene before these machinations plunge Faerûn into havoc, ruin, desolation, and devastation? A three-round Living Forgotten Realms Epic Campaign adventure for 24th level characters.
This adventure is a direct sequel to EPIC3-3 The Tangled Skein of Destiny and the beginning of the second season of the Epic Campaign. We recommend that you play the Epic Campaign adventures in order if possible.
This is a three-round adventure. We recommend that you allow a minimum of 12-15 hours of playing time.