The Battle of Brothers
At Beacon, all the rebellion warriors are at Prof. Ozpin's office to discuss who will be willing to confront and defeat Adam once and for all.
Ozpin: If it's wise for anyone strong enough to be Adam's match between strength, it will be the only sacrifice for a braver huntsman to end the war for the greater good.
Ironwood: Anyone will be able to command the Atlesian army to stop the White Fang until we have to die trying.
Nathan: I'll do it. If it means to protect you guys from being killed, I would like to accept my sacrifice.
Elsa: Then it's settled, Nathan will confront Adam and stop the White Fang once and for all, but if it doesn't work, then anyone else here will be twice stronger than Adam to finish the war.
Weiss: Very well then, good luck.
Meanwhile, Nathan is going to where Adam is located, while Russ is going on a bounty mission to kill an android assassin located through the ruins of Haven. Before they depart, they give each other one more goodbye if either of them dies.
Russ: Good luck with your fight, have faith in everything you love to guide you.
Nathan: If I die, promise me one thing if you live.
Russ: Anything.
Nathan: Take good care of Blake, its been 8 months until I finally located Adam so I can end the tyranny.
Russ: Alright I'll do it.
They hug one more time and they depart for their separate missions. Russ heads up to Haven to kill the android to prevent more assassinations but once he got to Haven, he found an underground lab which, to his surprise, there are more androids in progress.
Russ attached some bombs all over the lab but he was interrupted by the assassin, Russ activated his semblance to quickly kill it and he did. He planted more bombs, escapes the lab and detonated all the explosives, his mission is successful. Nathan however, managed to find the base of the White Fang in Mountain Glenn, he spots Adam and confronts him.
Nathan: Hello there.
Adam: Ahh, my former brother-in-law, you're the bold one. Kill him.
The soldiers prepare to kill him until Nathan takes his lightsaber out and kills the soldiers by decapitating them, and walked toward Adam.
Adam: Not bad.
Nathan: Your move, my brother.
Adam: You're a fool, this is what happens when your sister left me and the entire family for her own cowardice.
They fight, Nathan has the upper hand when all the soldiers surround them until the Rebellion appears to aid Nathan by taking down his former brothers and sisters. Nathan and Adam race to the cliffs so they can can fight privately, Nathan still gained the upper hand, but Adam used his semblance by cutting his former brother-in-law in half from the waist down. Nathan is still breathing but he doesn't have much time to live.
Adam: You're just as useless as Blake was, but you're not going to kill me, I am more stronger than anyone else to stand in my way.
Nathan: Well... you forgot... one thing... My friend (Russ)... is five times stronger... than you... and me... combined...
With that, Nathan dies and Adam returned to the battlefield only to see that all of his soldiers have died. He escapes to somewhere so no one can find him, unknown to him, a homing beacon was attached to his coat. The Rebellion frees all the imprisoned Faunus civilians and traitors of the White Fang, they return to Vale for tragic news.
Diana: Is everything alright?
Jaune: Nathan's dead. He's been killed. I'm sorry.
Russ returned from his mission, received the news so he could tell Blake only to see that her belly is very swollen, which he could figure out that Blake is pregnant with Adam's child.
Russ: When was the last time you saw Nathan?
Blake: Yesterday.
Russ: You know where Adam is now?
Blake: No.
Russ: Blake, I need your help, you're in grave danger. Nathan's dead.
Blake: You're wrong, how can you say that?
Russ: I received the news from Jaune, Adam is too powerful including his semblance, Salem happened to teach him everything she knew, after the death of Cinder, Adam became her new apprentice.
Blake: I don't believe you. I don't.
Russ: You need to tell me where he is.
Blake: You're going to kill him?
Russ: It's for the best.
Blake: I can't.
Russ: Adam's the father isn't he? I'm sorry.