In fantasy, there are often references to deities that no longer exist, and once had, on the mortal plane of existence, building structures and technology that was both revolutionary and cataclysmic when weaponised. Your task is to describe what this picture was! Was it a superweapon designed by the old deities, before they disappeared from our world? Is it a relic that blesses those who enter it to gain something positive? Or is it simply the abandoned home of a civilization that once lived on Earth, left to fade with the passage of time?