#heatherfell
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autisticundertale · 3 years ago
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Heatherfell
Underfell x Heathers (with some Deltarune sprinkled in)
(warning: chasriel lies ahead)
okay so ive been listening to Heathers, and a lot of the lyrics make me think of a obsessive fell Asriel, and my brain started uh...creating. Definitely expect art for this...
What if Chara wasn’t the first human that fell in? What if, instead, Kris fell in, and was the one who got poisoned by Asgore (since thats what happened in canonfell to Chara.) And then, when Asriel took their soul and went to the surface...they forced their soul to come out of him when the humans attacked, protecting Asriel with their soul and destroying it in the process.
So, Asriel lived, angry with Asgore. Toriel and Asriel move into the Ruins together. And then, years later, when Asriel is a teenager, Chara falls down as the second fallen human...the two fall in love, and eventually Asriel sneaks Chara out to see more of the Underground, protecting them fiercely.
Asriel, already losing his sanity from being stuck with so many violent people, is mentally getting worse now that he’s seen how kind Chara is. So, he decides their life is the most important, and kills everyone who even tries to associate with them. Chara, terrified when they discover this, breaks up with him. 
So, in his broken mind, he figures that if he rids of everyone, he can win Chara back and keep them to himself. He devises a plan to blow up the Core, after getting Alphys to tell him how it works. He knows that if he and Chara are in the Ruins when it explodes, they wont be directly affected by any radiation, due to it being far enough away and well-protected with magic.
Asriel tries to convince Chara to come, they fake suicide to get him to leave them alone, Asriel goes to blow it up on his own, deciding that his life isnt worth living anymore. So he just...sets up a regular bomb, when originally he was going to try and get a timer-bomb.
Chara goes after him, but theyre too late, and Asriel knows they dont have much time before it goes off. So, he rushes them into Alphys’s lab, and when Alphys is quickly informed of whats going on, she rushes them into the True Lab, since its underground and well protected. Asriel, however, doesn’t have enough time to get on the elevator, and instead forces the door to shut right as the bomb goes off.
...so, everyone except those in the True Lab and in the Ruins gets injured or killed. Not a happy ending, but...i couldn’t stop thinking about it. 
The lyrics that made me think about it originally were “I wish your mom had been a little stronger, I wish she’d stayed around a little longer, I wish your dad were good, I wish grownups understood, I wish we’d met before they convinced you life is war” (which is referring to Toriel distancing herself from everyone after Kris’s death, leaving Asriel to grieve and suffer alone, and of course Asgore poisoning Kris...) 
and then the entire “meant to be yours” and “seventeen” songs only solidified the idea mentally.
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