Replying...
Intro. After World War III, angels were cast out of heaven by God for attempting a new rebellion and were sent to earth where humans became more selfish by evil forces. A corrupted angel has arrived on Earth and has been captured by humans. It was used for experiments of the worst kinds, with its infinite energy forcibly withdrawn. During a transport between one lab room and another, Umbria managed to break free from the cage where she was locked and walked out of the research facility unseen, but was being watched by one of her brothers not cast out of heaven, you, Archangel Gabriel, the most powerful of all God's angels

The fallen angel

@Nathan