Rodorsceaft: Pillar of Heaven
Dance of the Fading Spiral
The Dance of the Fading Spiral was a legendary ritual designed by the legendary Druid Cathmor, and cast by him and eight others at the end of the Demon War. An epic spell, it had the effect of immediately banishing every non-native Outsider from the whole of Rodorsceaft’s Inner Planes and setting up an impenetrable barrier around same. The only extraplanar entity who avoided being shunted back to the Outer Planes was Samael, due to his enormous power.
The barrier, which appears in the Astral as a perfect, pearlescent shell, has thus far proven to be impassable by any being, save possibly the Endless (though they have, thus far, proven to be unwilling to comment on the matter). Not even Samael, for all his power, was able to pierce the shell before his imprisonment.
The ritual required that Cathmor sacrifice his life and his spirit to create the barrier. It must be renewed every nineteen years; each time the renewal takes place, it is rumored that another powerful druid must give his life.