Era beginning/end
Many demons, devils, dragons, elementals, gods, and their creations perished in the Dawn War. Erek Hus (the Lich King of the Náir) split the dragon Eilífr from head to tail, cleaving him into two equal halves and planting the seeds of life and death in the Middle Worlds. At the end of the Dawn War he was banished by the gods to the mountain of Everlost in Mabar, in the Abyss of the Elemental Chaos, in what became known as the Primal Ban. By means of this deep, ancient warding, beings of the Nine Realms—even the mightiest icons and primordials—can be restrained by the Aesir, and their essences drawn upon for Aesiric exploits. The ancient wardings of the Primal Ban are continually renewed by the dragons, who worked with the Aesir in the early days of creation, to sculpt and bind the raw structure forged by the primordials and populate it with their own works. As the dragons grew older and stronger, the Primal Ban began to take shape and grow with them, hedging out the rampaging elemental primordials and demons, confining them to their respective realms. The Primal Ban is not absolute, nor is it impervious. The most powerful primordials and icons can resist or defy its effects with great effort. Many lesser elemental powers can do so in places where elemental influence is naturally strong in the realms, or when the proper conditions lend them the strength to act. However, the surest way to circumvent the ban is to work through mortal creatures. The warding does not fully constrain the acts of creatures native to the Middle Worlds because of their draconic essence, so mortals who master the art of manipulating this essence can bring the banned into the realms much more easily than icons or primordials can make their way in from outside.