The Great Battle (Will fanfic; TW/VD/Supernatural/Originals)

Set in future Teen Wolf and Originals, as well as an unknown but later season of Supernatural. Chris and Kat have been back together again for quite a while. Kat hasn't aged though, due to Freya getting her a necklace that would stop her from aging. When Kat and Chris find out that there's a new hybrid species in town, they go tracking it down. Because she realizes it's half angel though, before hunting down the hybrid, she calls upon one of the other hunters she had a fling with when she was a vampire, back before she had to leave to deal with Damon's mess of opening up the tomb of vampires. Dean Winchester. When they hunt down the hybrid, they find out that although he did attack and injure the hellhound in town, he's not the bad guy. He's just there to fight a battle with Michael. Michael succeeded in convincing God to have him as ruler. Now, Michael wants to destroy what God created. His most precious creatures, the humans, as well as the entire world. Because Kat's been around for centuries before as a vampire, she's smart enough not to go up against an angel with very few help. And so, she calls upon Original help. Klaus, Elijah, Rebekah, and Freya. In the midst of the battle between them and Michael, what will ensue? Will Michael be destroyed? Can he be stopped?