John was seeing that Leon was furious because of his mockery when John begins to spin Mjølnir before throwing it at Leon.
Leon just stood still in the air as the hammer flying towards him didn't seem like a threat because he couldn't feel anything coming from it.
Leon dodges the hammer when he tries to grab it to throw it back at John to show him real power only to find out that he was dragged away by the hammer for a bit before letting go of it.
John only gave a little grin at Leon who was now raging as he rushed at John with his blade first when Vincent shoots at him trying to distract him because he thought that John was defenseless.
But the bullets just phase through Leon as he almost reached John when he shouts, "You will die today!"
John raised his right hand and blocked the incoming blade. On the impact between the blade and hand, a little could of dust came up making it difficult to see what has happened.
The cloud slowly dissolved revealing John holding the tip of the blade in his right hand. Leon was struggling against John's strength when John pulled him in closer to get a hang of his head.
Leon thinking that he could escape John's grip by using his Wraith Form would regret not letting go of his blade when he still could since John grabbed him by the head.
John pointed him in the direction of where Mjølnir was when the hammer suddenly responded and made a turn of one-eighty and flew towards John and Leon.
"Do you think I can't escape your grip," says Leon as he tried to use his Wraith Form only to find out that it didn't work.
Mjølnir was approaching and Leon was struggling, trying to free himself from John's clutches only to hear, "There is no way to escape. You can only surrender or die. It is up to you."
Leon only closed his eyes as he couldn't surrender today. He was doing what he was doing for the greater good of the realm. He would rather die than surrender.
Leon awaited the hammer to squish his head when he heard something hit the ground before he heard a strong breath of air blow into his face.
John caught the hammer with his right hand after letting go of the X-Blade before it hit Leon's face. Sora and the others were watching everything that was going on.
But it seemed that only Kairi knew who the person with the hammer was since she saw the sword he was wielding before.
John let go of Leon while saying, "You live today because your mother would kill me for killing our son."
"Dad!?" shouts Kieron as he and Leon were the only ones that heard him when Kairi's suspicions got confirmed while Xehanort was confused with how John might have returned to them.
Kairi rushed at John and jumped at him to hug him. John caught her with one arm. He could see that Kairi was sobbing for a bit before John pets her head before he places her down.
"We aren't done yet," says John with a warm smile as he looked at Kingdom Hearts and all of John's weapons appeared around him.
He picks up the X-Blade which Leon was using before and points it at Kingdom Heart while he looks at Leon and says, "Open the box we will finish it without you losing your life."
Leon was confused when John concentrates and his body begins to shine brightly while he chants, "I call upon you Lord of the Underworld. Stand by my side and help me defeat my enemies."
Hades appeared beside him and sees what was going on when he looks at John and asks, "What do you need me to do?"
"I need you to fight against the Thirteen Darknesses with me while my family deals with the Seven Lights," says John giving him a short explanation while he looked at Leon who was on the box when he nods to John.
John then concentrates and a ray of light leaves the X-Blade and it hits Kingdom Hearts while he says, "I summon you into this realm, Seven Lights and Thirteen Darknesses."
Leon opened the black box as seven of the thirteen Darknesses left it while another six appeared out of the night sky while the seven lights break through the sky as well.
They all manifested and John grabbed Judgement before he glances at Kieron and says, "Release the attack now."
"Yes," says Kieron releasing all his weapons at once while John rushed into the fray followed by the fourteen Kings.
Nesiara was seeing what was going on and stretches her hand out making Omega appear in her hand as she moves her other hand and Lux's and Yui's bodies disappear and appeared again beside the Keyblade Wielders.
"Aerith and Yuffie ignore the Darknesses and concentrated on the Lights. Let the Kings of Lucii deal with the Darknesses," says Nesiara as she rushed directly at one of the Lights.
They still hadn't completely manifested and with Kieron's all-out attack their manifestation was proceeding slowly. Leon didn't know what was going on because he didn't know of the plan that his family was following.
John suddenly began to float as his weapons began to float around him before he rushed with Hades at the Thirteen Darknesses. He was done playing as he tore two of his enemies apart using Judgement before he changed to using Yamato and Sinner and Saint going after another two of the Darknesses.
Hades was playing with his prey as he showed them true despair before he rammed his dark blade through their chest when he noticed that another Qi user was on the battlefield.
He was surprised at first but when he saw her engulfed in flames he knew what was going on and only smiled while saying, "He had it planned from the beginning. This is so exciting."
It was Nesiara who Hades noticed engulfed in flames as she pierced through the Light she was targeting while Aerith and Yuffie were fighting against one of them with little success until Nesiara helped them out.
She killed the Light off with her spear while Kieron was distracting them with his endless armament of weapons that were flying through the air attacking them. Vincent, Nora, and Mary joined them to fight off the remaining Lights.
Sora wanted to jump in and help them when Kieron stopped him while saying, "You are going nowhere near them."
"But they need our help," says Sora when John cuts through more Darknesses before he changed his weapons again holding Dragon Slayer and Omega in his hands while approaching his next enemy.
"See they are alright," says Kieron as he was on duty of keeping Yui and Lux safe with Leon who was seeing how easy it is for his parents to kill his enemies.
John was mysteriously enjoying this fight as his blood seemed to rush through his veins making his eyes get a darker tone of red as he slaughtered the enemy when he let go of Dragon Slayer and Omega to grab Mjølnir.
He lifted the hammer into the sky and it begins to release lightning into the sky making clouds appear over their heads before red lightning suddenly shot down from the sky upon him who only began to laugh.
His body began to expand as his body turned into a giant made out of red lightning with Mjølnir mimicking its new master as John entered into Red Thunder Emperor.
Seeing that Nesiara began to expand as well turning into a giant made out of flames which made Hades even more excited seeing the truth behind both their identity.
"To think I would see them fighting side by side again," says Hades as he retreated from the fight while using his Darkness to get everyone away from there on to where everyone else was before he created a barrier made out of Darkness to protect everyone.
The couple was only using some of their real strength as John just swung his hammer at the enemy as a trail of red lightning followed the hammer while Nesiara was swinging her spear and a trail of flames followed the tip.
They were destroying the Nexus as the water evaporated because of Nesiara and the earth seemed to break under their feet because of John. The enemy had no chance from the beginning, seeing how Nesiara and John were dealing with them.
Hades was enjoying the view while he was keeping the barrier erected so the others wouldn't get hurt. He also could use his full strength now that John can use Qi.
Only one more Darkness was standing which was the same one that John met before in the Realm of Darkness. It was fighting the urge of fear it was feeling from seeing those two giants taking them out as if they were nothing.
John looked at the Darkness when he throws Mjølnir after the Darkness which tried to save its hide only to find a flaming spear tip stop him on his tracks before Mjølnir squishes him into a paste on the ground.
John then recalled Mjølnir which flew into his hand again before he says, "Mjølnir, second form!"
Mjølnir suddenly grew bigger as it turned into a two-handed Warhammer. John took a big swing before he smashed Mjølnir's head into Kingdom Hearts.
"From today on there shall be no more Darkness nor Light. From today on there shall be no connection between Quadratum and this Universe. And from now on my son will be free of his burden as the guardian of this world," says John as Kingdom Hearts began to crack apart before everyone connected to the Kingdom Hearts world began to feel weak.
It was like someone ripped something out of them which was the Light and Darkness that they had in their hearts. Kingdom Hearts then exploded after absorbing all of the Light and Darkness inside all realms connected to it.
John was slowly turning back as did Nesiara. They were standing across each other surrounded by the devastation they created when Nesiara hugged him.
"Please let us not do this again," whispers Nesiara into his ear as John hugged her back.
"I hope so, I don't want to get stuck again five years training my ass off for two madmen," says John joking about the situation as Hades landed beside them.
"The time is up and I will now retreat. You should do the same since this Nexus will soon disappear," says Hades as John looked at Hades.
"Thank you, Hades," says John as Hades smiled at him.
"It is always a pleasure, my Lord," says Hades as he disappears in Darkness again