What is the Maximum Common Evility Slots and how can I reach it?

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Currently, the sardine in Chara World states that I can't up my evility slot count. My character has 10 common evility slots, plus 3 common evility "2" slots. Current level is at 395.
What other way can I increase evility slots other than, from what I have read, defeating Miss Heart (Evil?) in Chara World.
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Quick Answer about "What is the Maximum Common Evility Slots and how can I reach it?"
How do you get more Evility slots?
Thus, characters can reach a total of 20 Evility Slots....Units start with 5 Slots, but they can be increased by the following methods:How do you get unique Evility?
You get a class's unique evility by mastering a subclass. Once a subclass is mastered, you can purchase that class's unique evility from the skill shop and equip it in the unique evility slot. Based on your answer, it means Unique Character's . . . Unique Evilities won't be available.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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