Chapter 1: The Arcangel in Storybrooke
God first created the multiverse, giving life (including ours), but before God existed Darkness incapable of dying or feel something eternal, and light. Along with the life I appeared Death which remained neutral as he watched God created everything, so God began to create different universes. Each universe separate from each other, darkness: Amara began to destroy everything and I spectral beings be filled with black magic and infinite darkness.
God created the leviathans but were corrupted by darkness, her older sister, even the power of God was barely able to contain Amara, so I think the archangels Supreme beings of Light to fight Amara.
After a great war, God got Amara lock / Darkness in a parallel dimension where not bother anyone in a special cup on a remote planet. Which would eventually drink known as the Holy Grail.
God created heaven and angels to guard the created universe, then the Earth and the Milky Way.
That did not stop the darkness his power emanated constantly creating humans and creatures that God's people were stories or legends.
In part to counter the favorite creation of God: human only instead of having evolved and become common, he gave them powers and abilities that would be called "magic"
But there was a problem, the wizard Merlin and Nimue her lover used the Holy Grail for their purposes, one for justice and the other for personal gain, which set off a crisis between the two worlds with over time. Since the dark latter had created a powerful curse in order to find his son.
But God had a plan.
And that plan involving his more rebellious son the archangel Lucifer.
Lucifer was in Storybrooke seeking God's hands that were touched by God objects as the ark of the Alinza and contained their power to harm the dark chaos, the void which emerged these beings who received powers that exceeded natural laws.
This town was created by mediating an unknown magic power to many worlds after Emma Sawan ancestral merged with the darkness that existed before God came into existence. God had given him knowledge of what happened on Earth and had told him that people would weaken the power of their own.
Lucifer could not see or feel the dark but had experience dealing with it and how it worked and his strength was almost equal to God. But as darkness was all powerful, God was a great strategist and had a plan.
Emma felt a great power that had arrived in Storybrooke and for some reason it felt familiar.
Merlin would surely be looking for her to destroy God because he passed these things, what Emma knew was that this was not the work of a bad pre primordial much older and more powerful than God himself.
Emma hand dark specters joined to form a winged being who pursued the source of that power emerged.
Lucifer had to find the grail and re-lock the darkness was the best choice for now I get to the center of town suddenly a winged creature with teeth and approached him.
Lucifer raised his hand and telekinesis use but although I managed to destroy much of the asphalt the creature did not flinch, the beast was faster than light and rammed the archangel falling together in a fight of forces, the morning star had difficulty everything that the beast had his own physical strength giving blows.
Tele transported looking spotlights, Lucifer fell to the ground.
I take the beast of teeth struggling, external light appeared and a man appeared black leather.
Note: Before anything though I am a Christian Catholic does not bother me that the writers and producers of supernatural and once upon a time brought into darkness as the main villain. Nor that The Darkness is older than God, since block as described in the Genesis. That the principo everything was dark.