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Simply put, if you have all the spells, it's better to focus on defense and attack, as the 20% bonus will still be beneficial, and the "Readiness" skill gained from defense, combined with the "Tactics" skill from attack, provides a very good bonus compared to the general "Darkness" skill. After all, general "Darkness" doesn't really help you. If you've completed the campaign up to the 4th level, there should be a record of the entire campaign. Otherwise, you'll have to go back and replay the third level.