There is two endings you can chose from.

The Tragic End

The True End

Chara healed the wounds from Sans previous attack and prepared to take back his family back and destroy that wretch Underground he once called home. He carried his trusty knife in his right hand and teleported to above. He was in the middle of the forest and his eyes and mouth distorted when he plunged the knife deep in the ground, causing red to cover everything in its path. It slowly took over the forest, bleaching it pure red and it now was reaching Snowdin. Chara walked to the familiar presence he was so engrossed in.

Frisk almost had a heart attack at the sight of the baby's eye color, resembling Charas but calmed down when he realized it wasn't him, but a baby. The two waited for Sans by the window momentarily until a bit of red was entering his vision. Sans returned beside Frisk, eager to tell him what he found for him but was stopped when he also say the lining of red. A whole lot of it was coming and covering everything it touched. Sans frowned but teleported outside and used some of his magic and turned some of the red to blue but he would need alot of power to overturn the red.

Frisk shook and hyperventilated because he already knew what this was and it was only a matter of time before he came.

Speak of the devil and he shall come.

ehahahahahaha...ahahaha!

That laugh was dangerously low pitched and dark, it was a darker laugh than Floweys laugh.

All of the towns people was wondering what was happening and had touched the red only to turn into dust the moment they were near it. It broke Frisk heart and called after Sans to come back and get away from the red but Sans just winked and smiled.

"Goddammit Sans!"

He tried getting out the house but was shocked grabbin hold of the door nob. It was emitting a blue aura.

"Why Sans stop playing hero already!"

"Comedian so nice to see you again thought you killed me?"

Frisk knew that voice anywhere and went back to the window, I'm the midst of the opening of the forest was Chara. His lips didn't move when he spoke, the smile still black and wide. His eyes abnormally opened and black unblinking. He still had his human form present. Frisk frantically searched for his cellphone and did the only thing he could do in this situation.

He called for help.

Chara stomped to the center of Snowdin, in front of Sans.

"Well I sense my family in that cheerful little house you have I'll be taking them back now."

"Like hell you will haven't you done enough?"

"Haha quite the contrary I haven't done enough you should know the end couldn't be evaded."

Sans quit the talking and was ready attack as well as Chara. Chara threw a ball of black at Sans but it was thwarted by something else. They looked in the direction of the attack and there everyone was ready to fight Chara.

"I never thought this would become of you Chara."

" Alot of things you didn't know Father neither did you Mother but if you want to stop me, you all will DIE trying!"

"Nonsense darling it shouldn't be that hard to kill you will it Undyne?"

"Heck no I won't lose to some scrawny little kid let's go!"

Sans winked and smiled, cyan colored eye overflowing.

Chara just sneered and snapped his fingers, a red line wrapping them all together, all unable to move.

"Since introductions and speeches are over how about this I kill you all and forcibly take my family OR I'll show mercy and let Frisk decide come Frisk!"

Frisk couldn't just sit there and let this happen so he came out, child in arms. He had his head down as Chara was happy to see them.

"Frisk I'm so glad your alright and our baby looks healthy he even has my eyes I'm pleased to say the least now I have two choices for you chose all of your own free will."

Chara brought forth two buttons one said Give Soul and the other Don't Give Soul.

"Tell me what happens if I chose either of them Chara."

"Hehe very well if you give me your Soul I will spare your friends and leave everything alone entirely but if you give me the Soul you have just sold it to me which means I do what I want with you and you'd have to stay and obey me for the rest of time."

Frisk was visible shaking trying to hold it all together.

If you chose not to give me your Soul your friends will die but I will let you and my son go and live peacefully on the surface."

All color was drained from his face, both choices were not good but he couldn't leave his friends to die in the end he sacrificed himself to Chara.

*Give Soul -Don't Give Soul

You gave your Soul up.

"Wonderful choice my love I'll abide to the rules now."

The glowing beating heart was in front of Frisk, Chara held it in his palm and it dissappeared. He let his friends go. He called back all the red back to his hand and it was back to its normal state.

"Now let us depart from here we have much to do."

Chara opened a portal going in Frisk following after.

"Wait Frisk no!"

Sans held a thin hand at him thinking it would change his mind. It didn't. Frisk didn't so much as turn around. The last thing Sans saw was the back of Frisk fading away.

*Years later*

The place where they went was said to be hell, Chara being it's new ruler.

You can hear faint grunts and pleasure filled moans from within the despair ridden pit.

"M-More Chara I'm sure you can go faster than that ah fuck!"

"You've become quite the whore for this haven't you frisk?"

"Of course I have I love it!"

"Hmmp well you'll love this then!"

"Love wha-ahh you came inside again damnit Chara warn me next time!"

He got off of Chara and pushed all the semen out, it was alot...AGAIN.

Chara just casually laid down, satisfied immensely.

"I thought you liked it when I did that."

"Tch it's a pain to get out and clean if you havent noticed not only that I'd have a kid again."

"Watch your tongue or we can go for five more rounds. Besides aren't you used to having them now? We have at least ten kids now."

"Not the point asshole you try having all those kids and see how much pain it puts you in."

Chara pinned him right back down and shoved his tongue in his mouth, slithering in the process.

"And we'll have many more now since you didn't correct your tone of voice we'll be doing more rounds."

"Before we do this where are the children at anyway?"

Chara paused in thought.

"I think they're playing around the fountain of fire they were practicing how to control it and use as a ball to kick around and throw. Now hush I'll give you your share of Love it being the biggest and then we'll find them."

"Alright alright let's just get this over with it." Frisk put himself in position and waited for the penetration but it didn't come. He caught him staring deeply in his eyes. He suddenly felt exposed.

"Why are you staring at me like that?"

"The pink hearts in your eyes are very alluring on you and your eyes are pure black like mines that's intriguing."

"I'm yours after all now hurry up will you?!"

"Someone's fiesty but I'll give you what you want."

They made love again.

Frisk gave his Soul to save his friends and in return became a whore of the devil and his child bearer. Everyone in the Underground never forgot Frisk and dedicated their lives to be like him. Kind and honest.

Tragic End-A Pacifist Till The End