here some of my ideas for how a fellhorror could work since their one problem being that fell frisk dose not killed in underfell yeah they bold enough to fight but not have the heart kill but i have some ideas to make it work

basically here my ideas for a underfell x horrotale so basically instead of taken place after a netural route it takes place in a flawed closure route where frisk and flowey mange to befriends all the monster but asgore end up and toriel end up become ruler and decied to get rid of kill or be killed ruler and replace with  has instated a policy of non-hostility towards future humans that fall into their world. and basically the underground is started to recover and everyone have start wear their True Closure Route  clothes basically what if fellhorror is a compltey 180 of horrotale and i imaged that instead of sprites color be red is basically purple