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Arch-enemy isn't a huge bonus, but some people might find it useful. Before (meaning before the Tribes of the East expansion), I didn't really like these skills because it's hard to guess your opponent, but now it's okay, and you can even level them up. The bonus is good when you're focusing on attack! But as the game shows, Sylvan players tend to level up everything evenly (attack, defense, strength, knowledge).
Arch-enemy is a very good bonus, and you can predict it if you play well.