User blog comment:Princepurple/Some Questions/@comment-26271908-20160602194756

1. I would stick into saying that he was actually refering to the human's capability to kill each other, point that he tried to prove by creating the Demons

2. It's very hard to say. As we saw with the Knights of Hell, Lucifer could potentially drain power from the Darkness to corrupt Humans into Demons. We saw that Amara herself can corrupt people. However, the two Knights we are sure to have transformed both had the Mark of Cain at the time, making a direct connection to her, and, as we never saw other Angels doing that, it is difficult to tell if Lucifer used the power from the Darkness in order to create the Demons, or if other Angels could do it. It is also good to note that Amara's corruption of people turned them into mindless physical monsters rather than endarkened spirits imbued with supernatural powers

3. Actually, Lucifer became jealous to them due to the effects of the Mark upon him, and not in the sense he gained it after humanity was created

4. Gabriel and Raphael will stay dead, like how they are now, you know, because their supposed "father" does not care for any of his children, like Eve and Raphael himself pointed out. Michael is insane. He isn't a threat to anyone besides himself, and while he stays this way, he stays out of the game. Lucifer is implied to still being alive. If he is, then no dubt he will come back again. If he is dead, he will be exactly like Gabriel and Raphael