The Fall of Muldorn.

After the gods chained Nulcarn to a rock in a far corner of the world, there was a time of conflict among the pantheon, there was strife among the races of Eilendor.  Before another open war between the Vanir and Aesdir gods, they all gathered at Celest Val, to discuss peace.  Ardin, the Father, proposed the forming of a pact; the gods could no longer live in Creation, thus none could threaten or attack other's followers.  If any god broke this compact, their immortality was forfeit.  All the gods agreed to the Pact, Vanir and Aesdir.  A sword was forged by the stars to celebrate the Pact, called the Deaus Ral, or Gods' Bane to most.  But Muldorn, god of frost, terror, and undeath, broke the Pact and entered the world.  He gathered his followers, and loyal kingdoms, he made his most dangerous servant, Bel-Gorun the Tyrant.  Muldorn destroyed civilization after civilization, uprooting and enslaving races and throwing Eilendor into an ice age.  One god, Boleras, deity of the sun, was chosen to come down and challenge Muldorn, their fight destroyed mountains, shattered kingdoms, and smashed great gorges in the ground.  Finally, at the foot of the Mountain of Dusk, Muldorn killed his opposite, the god of warmth, and life, and took his heart.  Boleras, besides being the god of the sun, was the deity of the light elves, who fell into chaos and bloody wars because of his death.  The sun set that day, it was a sad sunset, many thought the sun would not rise again.  And it might not of, but followers of Boleras prayed to the spirit of the deceased deity and to the sun which he sustained.  The sun came up at its time, slow and sad though.  Because Muldorn broke the Pact and slew a fellow god, the Gods' Bane yearned for his ichor.  There was a prophecy, made by an eldar monk, which states that the "Fallen God shall reside in the circle of runes, in the place which lies in ruins, and a bastard prince shall take up the silver sword, and shall come against the Rotting One Who Is Immortal, in the fell lands.  And the fate of much shall rest on the prince's shoulders."