Demons

Demons are malevolent spirits that are the direct opposites to angels. They are created from human souls that have endured extensive torture in Hell by Bernael and demons. In this process, they become corrupted, extremely evil, and also very powerful. Similar to Angels, they require a vessel to walk the Earth, though they are able to roam in their smoke form.

Early History
After humans were fully evolved, God created a paradise on Earth called the Garden of Eden. He placed humanity in the Garden, and declared them his favorite creations. He told all the angels in Heaven to bow down before the humans, to serve them and love them more than him. The archangel Lucifer refused to bow down before a species that was younger, and inferior to him. He claimed that they were "flawed, and murderous." He declared war against God, and was eventually cast down to Earth.

God placed his most trusted angel, Gadreel, to guard Eden from the The Devil. He failed as Lucifer tricked him and snuck into the garden. To get vengeance on God, he tempted Lilith and corrupted her soul, making her into the first demon. Lucifer, still in the garden, further spited God by tricking Adam and Eve into eating the forbidden fruit. God cast humanity out of the Garden for disobeying him.

Following the creation of Lilith, Lucifer personally created and empowered four demons named Azazel, Ramiel, Mary, and Asmodeus. These four would become known as the Archdemons and were Lucifer's heirs and generals of demonic armies.

Years later, Adam and Eve had two sons, named Cain and Abel. Satan manipulated Abel into worshiping to him rather than God. Cain saw what Lucifer was doing, and offered his own soul, so that Abel's could go to Heaven. Lucifer agreed to the deal, but Cain had to be the one to kill Abel and take upon the Mark of Cain, the first curse in existence created by God himself. Cain obeyed, and bared The Mark. At some point he died, but The Mark didn't let him go, and instead transformed Cain into a powerful kind of demon called a Knight of Hell. On Lucifer's orders, Cain trained more demons, eventually creating a demonic army known as the Knights of Hell.

Seeing the threat the fallen archangel posed to creation, God created a personal cage for Lucifer, which was locked by bound with 600 powerful seals and needed 66 broken to open. The demon Samhain was chosen to be a seal along with Lilith, whose death would be the final seal to set The Devil free. As time went on, the demons that knew of Lucifer's existence gave up search and the younger demons disbelieved his existence, except for Azazel.