The Fall of Ys

Ys rules a city named after her. A city that takes after her too, in its debauchery and callousness.
Built on rocks stretching far out to sea, with towering walls keeping even the fiercest storms at bay, the city prides itself on being invincible.
Until, that is, the first of what become many, regular petrifying screams rents the air, causing trees, then animals, then even people to wither…and slowly die…