So I am working on my second force (Humans) and as I am looking at some of the traits that they can take came on Aristocracy (P21) "Aristocracy 2pts: Increase Command 1 (Level 3 and 4 classes only)" What is a level four class? They are not listed any place that I see anyplace (in this book or the FAQ 1.21).
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There is another way to create a Level 4 class without it being a Hero. You would have to take the trait "Lords of the Nether" on page 44 in the Infernal Sphere of Influence. This will give you the Nether Lord ability with turns a level 3 into a Level 4 and giving you a few traits and a stat boost. If your faction is not a Fey following the Path of Darkness you will have to use Forbidden Lore to get it.
The trait itself is expensive and the extra traits it allows you to take are x2 to the cost, so the price of your unit could sky rocket if your not careful.