The souls of the damned cling to the bones of a captured skeleton. They infest the carcass, taking over from the host and fighting for control between each other. The blues flames are lit from the energy exerted by each soul, trying to take over control for even just a second, to feel something other than the emptiness that they have damned to. The flames reach temperatures so hot that eventually the skeleton will deteriorate, leaving the souls to fall back down to the ground, where they belong. They are damned to repeat this cycle for the rest of time.