Isaac faced his attackers with anger, fear, and excitement. He could feel his hands sweating and his heartbeat racing. "Geez...I feel so excited to fight new foes! But it would be nice if I knew their names and what they do..." Isaac thought.
"I believe I can help with that Isaac." Isaac heard Sion say.
"S-sion! Can you really!?" Isaac exclaimed.
"Yes I can Isaac. I had great knowledge of all the worlds and their inhabitants. Now let me input the information into your memory Isaac." Sion replied. And in an instant, Isaac knew all about his attackers.
"Heh...alright guys. How about you let me go and we can forget this even happened." Isaac said.
"Not happening!" Roxas said.
"Well alright...I guess I have to take you down...Roxas, Lea, Leon, Yuffie, and Aerith." Isaac said, smirking.
"W-what!? How do you know our names!?" Leon said.
"That's not important. But you should know I'm about to kick your asses right now. So you better be ready!" Isaac screamed as he charged, summoning multiple Shadows and Soldiers to attack with him. As the Heartless went and attacked Roxas, Lea, and Leon, Isaac went to attack Yuffie and Aerith, mostly since Yuffie could attack from long range and Aerith could keep on healing them.
"Y-you're good, I'll give you that...but I'm better!" Yuffie said as he tripped Isaac.
"Oh really!?" Isaac said as he strook Yuffie's legs with his Keyblades. As Yuffie screamed in pain, Isaac took the chance to continuously strike Yuffie multiple times before kicking her in the face and sending her flying into the fountain. And just before Aerith could heal her, Isaac went ahead and attacked her and took her out easily, since Aerith wasn't equipped with any weapons.
"Yuffie! Aerith!" Leon cried, but before he could run to them, Isaac ran up to swung his Keyblade at Leon. Leon was just barely able to deflect the swing. "Damnit! Why are you doing this!?" Leon cried out.
"I told you to let me go. You declined my offer. So you guys brought this to yourselves." Isaac said with a cold glare. The next thing they knew, they were exchanging swings from their weapons, neither one giving up. But as he fought with Leon, he smirked as he saw Lea had been defeated by the Heartless and now they were targeting Roxas.
"Lea! No!" Roxas cried out and what he did next surprised Isaac. His Keyblade changed to a different one and he also now had a second Keyblade, just like Isaac.
"What!? He can summon two Keyblades too!? Wait...oh yes...now I see. He has done it a few times...those are the Oathkeeper and Oblivion Keyblades. Well played Roxas." Isaac thought to himself.
Isaac decided to use the same move Yuffie had done on her and he tripped Leon. And just as he suspected Leon to do, he tried to strike his feet, but Isaac was prepared. He jumped up and kicked Leon in the chest, then he grabbed his feet and swung him towards Roxas. This surprised Roxas as he fell and lost his balance. Before he could recover, Isaac kicked Roxas' Keyblades out of his hands and points his Keyblade's at Roxas.
"It's over Roxas. I've won. I've taken down your friends. If you know any better, you should let me leave here now without a word." Isaac said. Roxas didn't say a thing. And he didn't need to. Isaac was letting his guard down and this was the perfect chance to take him out. Roxas summoned his Keyblades again, which caught Isaac by surprise, but before Isaac could react, Roxas stabbed Isaac with both of his Keyblades.
"U-urk!" Isaac said as he slowly moved back, clutching his chest. He was dying and he could feel it. Isaac was starting to fade away and fall to the ground.
"ISAAC!" Sion cried out. But just before Isaac died, he was suddenly surrounded by Darkness.
"You still have much to do boy. You still need to fulfill your destiny!" the old man said to Isaac.
Isaac suddenly got up. He felt himself filled with Darkness. He knew he needed this boost to beat Roxas. He saw that he had a special Heartless with him. "A Guardian...huh. This will be fun!" Isaac thought to himself. He also saw that he was still wielding two Keyblades, but his Starlight Keyblade was replaced with a different Keyblade. "The No Name Keyblade..." Isaac thought. Isaac chuckled and charged at Roxas.
Roxas never stood a chance. Isaac swung his Keyblade multiple times at Roxas and whichever swing missed, the Guardian made up for that. And whenever Roxas thought he had an opening, his attacks would be blocked by the Guardian. In a matter of moments, Isaac swung his Keyblades one last time and sent Roxas flying up in the air and landing on the ground with a hard impact.
Suddenly, Isaac clutched his head and groaned in pain. His vision was getting fussy as he returned to normal, the No Name Keyblade returning back to the Starlight Keyblade. Isaac could see two figures. A white haired boy and a dark-blue haired girl. They seemed to be smiling at Isaac. Suddenly the visions stopped and he saw that all his attackers were down.
But he sensed a presence and before Isaac could do anything, he was hit with a Firaga and was knocked out.
An hour later, Isaac woke up and found himself in a bed. He slowly got off, though he still felt a little pain. "D-damn...where did that come from...?" Isaac said.
"I see you're awake." a female voice said. Isaac turned and saw the the owner of the voice: Aerith.
"Aerith...where am I?" Isaac asked.
"You're in the infirmary. You're lucky I spoke up for you or else the others would've killed you already." Aerith said.
Isaac gulped. He had already almost died today. He didn't want to experience that a second time already. "...Why did you speak up for me?" Isaac asked.
"To be honest...I'm not sure myself...I only did what my heart told me to do." Aerith replied.
"Your heart? Huh..." Isaac said as he looked at his chest.
"...You're not a normal Keyblade wielder...no normal person can succumb to that much Darkness and still be full of so much light...anyways, you should get some rest. You'll need it for your trip." Aerith said.
Isaac only nodded. He gave Aerith a smile and laid back down in bed and fell asleep as Aerith left the room.