From the PDF
Tales from the Wild Blue Yonder: Chapter II
Magister Lor is the last surviving member of the Strelai — an ancient order of mystics that imprisoned the demons who cast the worlds into the sky.
The Magister has secretly trained a young apprentice, Kai Tuvari, in the occult art of Sorcery, because Kai’s blood is bound to the essence which lights the sky-star and gives life to the worlds. Only the discipline of Sorcery can control this power.
However — Magister Lor is not the only one with a secret apprentice. The demon Setarra, imprisoned in the essence crystal which powers Lor’s sanctum, has visited Kel Tuvari (Kai’s twin) in dreams, whispering dark promises and extracting dire oaths. Magister Lor chose not to train Kel as a child — the power in Kel’s blood was too dark and dangerous to ever draw out safely. But
Setarra had other plans.
Even now Kel has crept down to the lowest level of the sanctum and completed the ritual to release Setarra from her crystal prison. The demon emerges, singing the song to summon the great Leviathans from the lower depths.
Will the Magister stop the Leviathans from dragging the crystal into depths? Will Setarra free the rest of the demons from their prison?
Will the twins turn on each other, or betray their masters?
Why were the demons imprisoned? Does anyone remember? Can enemies change their beliefs, or are duty and vengeance the only ways?