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A Secret Book can be used to increase a unit's skill, although the number of stat-increasing items that can be used in any game is limited. This being the case, Secret Books are usually given to those units who have low skill normally, such as axe-fighters.
To calculate the chance of a critical, the formula is usually as follows:
Unit's Skill / 2 + weapon critical chance + support bonus (if any) + the class critical bonus or skills (if any) - the enemy's luck
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