How to Beat Amalgamate in Undertale
Just keep petting it! Pet it enough times and you'll be able to spare it.
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First hand experience here: Beckon -> Pet -> Play -> Pet. It will then be satisfied, and you can spare it. Works like a charm every time!
Don't fight it. Try playing with it! Beckon it over, pet it, and play. It likes attention more than violence.
To beat the Amalgamate in Undertale, you need to calm it down! Use the 'Beckon' action, then 'Pet' it multiple times. Follow up with 'Play' and 'Pet' again until it's content and ready to be spared.
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