Here's the finale of Kingtale, yay
After a few minutes, Undyne came back to take them to the king. But just before they entered the throne room, Undyne took off their chains and gave Frisk her knife back. They entered the room pretending to be chained.
They saw the king. After Undyne left, the king got off his throne and walked upto them. Just when he was pulling his sword, Sans and Frisk attacked him at the same time. They started fighting. (I recommend imagining this scene while listening to "bones and more bones" on youtube) After fighting for a while, Sans finally knocked the king down. Just when he was about to make his final strike, the king took out the 6 human souls they had, and absorbed them.
Btw its really risky to absorb 6 souls without the 7th one, because a monster soul isn't strong enough to contain that much power for too long. Without a 7th soul to support the body, the monster's body would shatter.
The king was more powerful with the human souls. He cut Frisk's knife into two and gave Sans a fatal injury. Frisk ran to him and took out the pie slice she was keeping, and gave Sans a bite to heal.
The king froze upon seeing the pie, and asked Frisk where she got it. Then Frisk decided to talk him out of this. Her words angered the king nad he attacked her again, but he wasn't attacking as strongly now. Frisk told him that this isn't what he wanted, that he was trying to find a meaning of fighting. That he was taking his anger out of the underground, and that this wasn't gonna fix anything.
The walls thr king built around himself finally broke, and for the first time in a really long time, Asriel cried. Frisk let him eat his mother's pie for one last time.
There were cracks forming on his body, due to his body being unable to contain the 6 souls. He stood up, saying that this time, he will do the right thing. He walked to the barrier with them, then the picture here happened
After this, Asriel used the 6 human souls to break the barrier. After the souls were used, his body and monster soul finally shattered, leaving Sans and Frisk alone there.
They walked out ot the gate and watched the sunrise, their bright new future.
...As a small flower opened his eyes back in the Ruins.
Huge thanks to @dreamweave01 and @imakerandomfanart for following this au and making me feel like my efforts weren't for nothing :,)