Hellish promise

Once upon a time, there was a glowing city protected by golden gates known as Heaven. It was ruled by beings of Pure light, Angels that worshiped good and shielded all from evil.

Lucifer was one of these angels. He was a dreamer with fantastical ideas for All of creation. But his way of thinking was dangerous to the order of their world. So, he watched as the angels began to expand the universe in their ways. From the dust of Earth, they created Adam and Lilith, equals as the first of Mankind.

But, despite this, in secret Lilith betrayed the heaven by fledging the Garden. Drawn in by her fierce cruelty, Lucifer found her, and the two traitors orchestrated a plan to ruin everything.

Together, they wished to share the sin and evil with humanity, offering the Fruit of Knowledge to Adam's new bride, Eve, who gladly accepted.

For with this single act of disobedience, evil finally found its way into Earth. With it, a new realm of darkness and sin. And the order Heaven worked to maintain was shattered. As punishment for their reckless act, Heaven cast Lucifer and his lover into the dark pit he had created, never allowing him to see the good that came from humanity, only the cruel and the wicked.

But Lilith thrived, empowering demonkind with her voice and songs. And as the numbers of Hell grew, so did its power. Threatened by this, Heaven made a truly brilliant decision. That every year, they would send down an army, an Extermination righteous warriors who went down to keep the peace...
one of them was (y/n) first Lieutenant of exterminators. Unfortunately for him something bad was about to happened to him.
(hey guys as you can see I decided that there is not really good story from angel prospective. so I will make one. this is my first story so it wont be best but I will try hope you enjoy)