We were all created for a purpose, we helped and gave the humans miracles. We influenced them to be pure and virtuous; who could have know that they influenced us as well...
Our most graceful sibling, the former Seraph named Lucifer, was influenced by the sins of humans and their talk of freedom. Rallying us to go against God claiming that He was unfit to rule over man and Angels. We followed him to the Hill of Most High, where Lucifer fought with Michael. Lucifer being a Seraph at the time should have won, but in the end the Archangel won and we were banished out of Heaven.