There are scores of learned works, dissertations and treatises about this magical cataclysm from about 1500 years ago. Because of this event, creatures never seen before entered our world, and still do not have their own ecological niche here. Among others, graveirs and ghouls are relics of the permeation of the spheres, though elven tradition has it that we, humans, are also newcomers from that time. The sorcerers claim that time humanity received both the wondrous gift and the terrible curse that they consider magic to be at that time.