Reply to Re: Balance
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The simple answer is you test it. If it's too easy you can up its health/defense/damage accordingly. Another thing you could do is adjust the frequency to which the boss uses any special moves. Alternatively you could add stuff like the boss regaining health each second to force the player to feel rushed(which can cause them to make mistakes.) Make the boss summon minions or something. If it's too easy just add more stuff to it.