Of all Metaphor: ReFantazio bosses, Heismay proves one of the toughest to beat. Equipped with the ability to create and control clones on the battlefield, not only is it difficult to distinguish the real opponent from the fakes, but, to make matters worse, attacking clones will also prolong the fight. Luckily, the flighty bat has one simple tell that gives his position away.

https://screenrant.com/metaphor-refantazio-how-to-find-beat-heismay-boss/