Sora hesitated before following Asgore into the next room. He found him standing there.
"Think of this as like... A trip to the dentist."
The king continued ahead into the next room. Sora followed. He saw a giant white light ahead of him. It pulsated, like it was breathing.
"This is the barrier. It is what's keeping us all trapped in this prison we call the underground. Are you ready, Sora...?
He summoned the keyblade, regretfully. "I think so."
"Alright then." Asgore looked at the ground. A trident appeared in his hand.
A strange light fills the room.
It's the voice in Sora's head.
Twilight shines through the barrier.
It seems this journey is finally over.
You're filed with
DETERMINATION.
...
Asgore looks Sora in the eyes one last time.
"Sora. It was nice to meet you. Goodbye."
He pulled back his arm, and thrust his prepared weapon towards him. Sora stepped back and attacked Asgore with his keyblade. Asgore didn't block or dodge. He just stood there and took it.
...
Suddenly, Asgore cast fire all around Sora. The boy leaped over his ember. He jumped down and missed the king with a diving strike.
This made the onlooking flower laugh.
...
The king prepared his scythe. He swung three times in a predictable pattern. It hit Sora once, and it was a weak attack nonetheless.
...
Flowey summoned five shadow heartless.
"Hey! See those hearts in there? In the little canisters? Grab those souls!"
The small creatures waddled into the barrier room. One of them grabbed a canister containing the yellow soul and started running away.
...
Sora saw something small and dark moving out of the corner of his eye as Asgore summoned another ring of fire.
"Asgore!" He said, bringing Asgore's attention to the matter at hand. "Heartless! And they're trying to steal the human souls!"
"What!?" Asgore looked up. He charged and took out the heartless with a single attack from his trident and regained the soul. Meanwhile, two more shadows were attempting to grab the purple soul. Sora swiped at them and put it back down by the others.
A single heartless picked up the green soul.
"Fire!"
Sora and Asgore shouted this in unison as they both shot a ball of fire at the opposing enemy. They exploded on impact. It's scientifically proven that two fireballs with explode on impact, I promise.
Suddenly, they saw yet another shadow. It was roughly twenty feet away from the others. It rolled the canister containing a cyan soul out of the room and around the corner. Sora and Asgore heard the shattering of glass on the other side, then someone erupting into laughter.
"F-FINALLY!" A voice screamed. Vines suddenly shot from the hallway. They entangled Asgore and Sora, as well as the other five souls.
"What is going on!?" Asgore protested. "Who ARE you!?"
"Don't worry!" Said a familiar voice, at least to Sora. "It's just me! Your best friend!" A small flower grew in the doorway. "FLOWEY THE FLOWER!" The flower grinned. A thorn covered vine wrapped around Asgore. It began to crush him. His arms slowly turned to dust.
"Asgore!"
"It... Will be alright... Sora..."
He was turned into dust. The vine dropped.
"You dirty-!" Sora exclaimed.
"Oh, don't be a hypocrite!" Flowey interrupted, "You're no saint yourself!"
"My god, how many people were watching me on this journey?" Sora said sarcastically.
Flowey chuckled. The vine enveloping Sora suddenly grew thorns on it. the last thing Sora saw was Flowey laughing hysterically, before he collapsed on the ground, and died.