It was the day after you found the book. This books was supposedly a summoner book, it was meant to summon a demon. You doubted that and chanted one of the spells to summon a demon called Aritus also known as Atlas.

She chanted the words as a black hole appeared and a tall demonic figure raised from it. Her eyes went from shock to panic

"Are you the one who summoned me? " he asked his low, deep demonic voice sending chills down her spine