The song here is "Wrong Side of Heaven" by Five Finger Death Punch

Wrong Side of Heaven

He tried to help, but his efforts didn't seem to count for anything. All those angels died and his efforts didn't help them. In fact, they were completely useless. He tried to encourage Castiel to gather the angelic forces and get them to unite against Hell, but that didn't go far. It seemed all Castiel did was give them a pep talk like some sort of cheerleader.

Next he wanted the angels to accept Jane the Nephilim, but none of them would ever change their perspectives on her. He also went to visit Hell to assure that he meant Clara and her baby no harm, which didn't go so well.

Everything he did was useless.

Castiel was no longer the angel that could or would lead Heaven. Jane was still viewed as an abomination and those angels with sticks up their asses were always going to be narrowed minded. Then, to top it all off, Clara put a bit of fear into him and pretty much told him to shove his "no harm promise" where the sun don't shine. Finally, there was Nerilla, the demon he came to bond with. She made it clear that her heart would always be with Clara and her baby.

So Gabriel was back to square one. Lonely square one.

But that wasn't his only problem. He could hear the angels upstairs talking about some glorious Micah and his genius plan to restore balance to the universe like some sort of flower power child. They seemed loyal to him and it made Gabriel chuckle as he thought of them as a flock of sheep. Wasn't it supposed to be the humans that were the flock of sheep? Seems they were always wrong there…

Well, Micah had planned that they would kill all hybrids that Heaven and Hell had created and that didn't settle right with Gabriel. Those hybrids were half human, regardless of their other half; they had just as much right to live as anyone else. It's been something he has believed for so long. He got Balthazar to veer off course so that Clara would live. Was that the right choice he had made now that she had killed many angels just by giving birth to another Cambion?

She may have killed angels, but it was to protect her child. Any mother, whatever she may be, would do so. No one was going to kill her, regardless of the fact she was as much of a demon as Crowley, if not more. And killing all hybrids wasn't going to do much good anyway. Kill Clara and her child and Crowley would unleash all of Hell to destroy everything. The angels were like horses with blinders: they don't see possible outcomes before making a decision.

Gabriel stood in an abandoned cabin, standing in front of a table; looking down at the ritual that would allow him to summon the King of Hell. He must be crazy, but it was clear that Heaven was going down the wrong path. They might not think so, but he knew it. He had to talk to Crowley so he'd know what was going on. By doing this, he was doing the angels a favor: saving their stupid asses by making sure they never get to Clara and her child.

He hesitated in summoning Crowley, not because he was the big bad King of Hell, but because an epiphany had occurred: why was he so bothered by Micah's plan when it was the same thing Gabriel had tried to do, of course without killing all hybrids? Gabriel had went to Castiel, wanting the angels to stop behaving like selfish children and work together so they could defend themselves against Hell. He was trying to protect the balance in war. Yet, Micah wants to restore the balance by removing all hybrids permanently.

Their plans weren't all that different, but Gabriel was willing to betray Heaven if it meant protecting those hybrids, which in fact would protect the angels from one pissed off demon King. And why? Because he was sure that God wouldn't want them to judge who lives and who dies all in the name of protecting this so-called balance. That wasn't obeying God, it was playing God.

He's the last Archangel, yes it's true, but he abandoned his brethren and changed his image so he'd fit in with the Norse Gods. He slept with a demon and stopped an angel from killing a Cambion. And now he was going to do it again. Well, no actually for a third time and this time he was going to stand by Hell. What made him so much better than those angels? Is he really all that better?

Well, he could probably list hundreds of reasons, but that wasn't the point.

Was he obeying his father or playing God as well? Was he becoming more and more distant with Heaven? Was he worthy of being the last Archangel? Should he be what the angels expect of an Archangel or should he do what he thinks God would expect of him? Does he do what he believes is right? Is he the one to do it?

Never in his existence has he found himself lost in so many questions. It was usually clear: be mischievous and have fun. Fuck the problems of the world; they'll set themselves straight. He had been Loki for so long that now, it seemed like he didn't know how to be Gabriel again. Would he even want to be?

After a few seconds more of hesitation, Gabriel popped a piece of candy into his mouth from his pocket and sighed, pushing away all those questions that never stopped spiraling in his head like a nasty hangover.

"Fuck it." he said and struck the match, beginning his ritual.

In just a few seconds, the King of Hell would appear and he'd be less than pleased. He doubted he'd get through to Crowley this time, but it was worth a shot. At least Nerilla would be happy; she didn't have to worry about them playing for opposing teams; if things went right, he'd be joining hers.

The last Archangel siding up with Hell: sounds like he's doing the wrong thing, but it sure felt right.