Lucifer - Pride
Before the biblical God created the world, he first created the heavens, and then he created the cherubs, angels, and archangels within the heavens. The Archangels were the highest-ranking angels and the primary messengers of God himself. Among these Archangels was Lucifer, the highest Archangel of them all. In Demonology, Lucifer represents the sin of Pride, one of the seven deadly sins.
He was characterized as the most beautiful creature God had ever made, a magnificent person who was flawless in every way. But, in comparison to his colleagues, Lucifer was so flawless, so attractive, so divine, and so powerful that he became haughty. His superior attributes to God's other creations prompted him to become arrogant, and he eventually believed that he should be in God's position. He wished to become God. Given that he was regarded as more worthy to be in God's presence than anyone else, and that he arguably understood God better than anyone else, Lucifer could think of no one better than himself to destroy his Lord. It could even be argued that his ambition exceeds that of gods, that he desires not only to take God's place but also a position higher than that of God.
Lucifer's pride would drive him to act on his assumptions that he was really more powerful than God. It was pride that blinded him, the pride that drove him down a path of haughtiness, and pride that saw him begin to manipulate the other angels into serving him; after all, his intellect was greater than theirs, so fooling them was not beyond his means. While some angels remained faithful to God, many of the fallen angels, like Lucifer, began to regard him as the superior entity.
With a third of the angels on his side, Lucifer launches an attack on God, sparking a titanic battle for the sky. But Lucifer had not anticipated the overwhelming opposition put up by another Archangel, Michael. Lucifer transforms into a dragon after failing to overcome Michael in his current form. And there was a conflict in heaven, Michael and his angels fought against the dragon and the dragon, and his angels did not prevail; nor was their seat in heaven found. While you could argue that Lucifer had the bravery to rebel in the first place, many would argue that this was more so blind hubris, he is finally destroyed by Archangel Michael. This demonstrates how powerful the biblical God is, as Lucifer is defeated without the need for God to intervene. His other namesake - Satan is the one he obtains after being defeated. Lucifer's fall is more than simply a loss of pride; he loses everything. He is not only rejected by God but he is also expelled from heaven, along with all the other angels who supported him. God put Adam and Eve to the test by banning them from eating from the tree of knowledge when he created them. He entered the Garden of Eden under the guise of a snake after spotting a chance to mock God.