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I apologize, but I don't want to engage in an argument with you in this thread. Your aggressive communication style won't lead to any constructive outcome.
Yes, "Sworn Enemy" doesn't work as a mechanic for dealing extra damage. The "scout" mechanic is designed to, at least, justify taking a developed/expert Avenger early in the game and building the guild early: besides revealing the stack itself, you can also see what it's guarding. As a bonus, there's a small synergy that I mentioned above.
Where can I find those that I didn't place simply because I couldn't find them on the map?
"Sworn Enemy" isn't just a simple +damage%, so you can designate any creature as an enemy at will. There's a factor of randomness here. By the way, don't be lazy and calculate the probability that, among the 25 neutral creatures seen on the map, there won't be a single creature of the same Faction as the opponent (hint: 3.5%).
"Sworn Enemy" is a situational skill, not a "non-working" one. You first find creatures of the opponent's Faction on the map, and then, if you find them, you gather a "rain of Berserkers" (a wall of fire, or anything else) and deal damage to 2-3 stacks with a 40% bonus. If you don't find them, you focus on developing something else.
Added 7 minutes later
Very cool solution that instantly balances the Dwarves in the late game. Only 10 is a bit too much; I would make it exactly 7, but the principle itself is very good.
UPDATE: Although I looked at the price changes for the runes, with the new prices, 10 is the most reasonable.
Thank you, implementing this in the scripts gave me a headache, and I think bugs will still pop up :\