Ok frisk was corrupted by chara,chara trys to make her determination into hate,BUT A BIG BUUUUUUUUUUUUT,Frisk uses chara's,knife to destroy her determination knowing she will die but for good chara dies with her,and both get destroyed,BUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUTTTT,Theres a post-credit scene so if you wanna know what happened see it or dont and just wait till another AND BETTER explanation -Fartyguy