Well there are many ways to break a narcissist's spirit I would sujest convinceing them to try something they would be poor at. Although this will vary depending on the person ether chess or a souls like (eg dark souls 4) will likely be outside of there abylity set as they are two compleately difrent skillsets. Therefore at least one of them is likely to cause frustration, anger, embarisment, depresion or self hate witch should safishantly forfill your objective to break there spirit. if nether of these examples work try to find something else that they strugle with.
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