The sky monster is a singular light in the skies of Droelep, a rather Earth-like planet in a system much like our solar system
For part of the year, it moves from horizon to horizon on a smooth line, no different to any star. But at a point it begins to wander like a planet, following a unique path in the sky. Later in the year it takes on a meteoric nature, appearing and disappearing from view wherever it pleases. But this phase soon ends and it returns to its planetary path, before it returns to its place with the statsstars to repeat the cycle over again
Is there any object out in space that could display such bizarre behaviour in the night sky?
This universe has no magic in its astronomy, and space is essentially the same as in reality