I have the game and the bosses are so OP!!!!
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I am going to assume that the bosses are like the Souls series. They all have set patterns that can be easily exploited. First time you fight a boss, just observe. You'll begin to notice these patterns and then the boss will become easier.
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I quit out of boredom too many roll I-frames.
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Any game that relies on OP bosses to pad the game out deserves to fail as this one did.
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Go play Souls games for easier and more toned down bosses. My favorite is Quelagg.