Not at all... I myself have done this, and there's nothing particularly unfair about it. And what about the Chaos Dragon, which is immune to magic – isn't that overpowered?
Yes, this rune significantly increases the effectiveness of the Jarl, but it doesn't compensate for the weaknesses of all the other troops. Besides, who would think of surrounding the Jarl with a ring of troops? What else is there to do?
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