Hi sorry but I'm not really a big fan of the inverted fate AU but I will make a asgore fight in the future though :)
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Do you know that scratch project of IF Asgore fight where there were a Bunch of a lot of endings? You could base it off of that. https://scratch.mit.edu/projects/423022180 this is Very faithful to the comic but also lets you get other endings, You should Try playing it then make that project.