Tears of Vykyris

From the introduction:

This scenario is about a young woman called Wren and the people around her, as they confront a world shattering plot orchestrated by Carnun. Carnun is a powerful being from beyond the bounds of the known world, Gaia, who has been trapped in his own pocket of Hell for crimes he committed in the distant past. He struggles to escape his imprisonment and has finally found a way out through Wren.