Edge of the Sun (Numenera RPG)

The greatest work of the prior worlds: the Engine of the Gods! Few who dwell on the Ninth World even know of the greatest achievement of the ancients, for it rests imperceptibly, despite its vast size on the very edge of the Sun itself. What horrific danger what incredible threat, to the Sun and our world compelled them to such an audacious creation? Has that threat been ended? Or do the beings that dwell upon the Engine (for yes, it is home to many strange creatures) struggle now in vain, unaware that their mission no longer protects them or us from cataclysm on a scale that dwarfs even the audacity of the prior worlds most staggering work?