While I understand that any boss can be beaten by staying at lvl 1, it isn't exactly practical.
Which is why the alternative (grinding) is a con against the game in my opinion.
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I've never had to grind, leveling is really easy, and even though you may not be as high in stats as you'd like for a certain boss or level if you use caution and strategy any boss can be beaten. Difficult but rewardibg