Lifestream

The Lifestream is an incorporeal substance of ethereal mana that fuels Ancrya, giving life to everything. Its nature is not fully understood by scholars and only the Angels, whose souls are nigh-eternal, can safely observe and traverse the sheer power of it as it circulates through the worlds.
 * The flow of the Lifestream carries departed souls with it, sending them off to the stars where they are cleansed and purified. There they await rebirth in an unconscious void until their soul is prepared to be reborn in a new form, free of the memories and constraints of its previous incarnations.  Reborn souls carry no recollection of their time in the Lifestream, nor of any previous lives- with few exceptions.
 * Those that generate depravity and sin in life corrupt the Lifestream, as it serves to cleanse foul souls so that they might again attempt ascension to Elysium. This has the effect of harming the corporeal plane in  a multitude of ways, from poor crop yields to the natural phenomena known as plagues or blights and even as draws for demonic forces that feed off of the refuse of corrupt souls.
 * As a mana source, the Lifestream is a pure, shimmering white aura. In the spirit world, the Lifestream can be seen in great waterfalls or flows of spiraling energy, and can only be perceived by those sensitive to the magical nature of the world. Mortals who attempt to harness its power have been known to become overwhelmed by the sheer potency of the Lifestream and their souls are whisked away in the current to atone for their hubris.