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Concentration applies half its +% Damage (rounded down to the nearest percentage point) to magic damage.
This bug allowed the paladin to defeat the game without any item.
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Smite always hits and cannot be blocked
This bug allowed clearing Uber Tristram even with a lvl 24 paladin, only using a shield with perfect diamonds
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Both bugs destroyed the game balance. In normal pvm play but also in pvp, making the paladin class the most used character due to the massive power they reached.