Vayshan
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Pyrokinesis doesn't seem to increase fire element spells by 33%; instead, it deals fire element damage over a certain number of turns... However, you still need to acquire the necessary spells. As far as I remember, there are only two: Fireball and Armageddon. Armageddon is obviously not a viable option, and Fireball might not even appear. Why would you have to use tactics? On the contrary, specializing in Wingael increases the chances of his troops going first, and by leveling up tactics, you can only make his life easier by positioning your troops in front, making it much easier for him to reach them. Forest elves have very high defense, so it's definitely better to take Dark Riders, as ignoring defense will be not just useful, but a necessary skill for them, unlike the Swift Riders' ability. As for the first level, you can technically take either, but I would choose Stalkers; they have quite decent initiative and will definitely manage to become invisible and reach the archers. Of course, the opponent might group their troops in such a way that the archers are inaccessible, but that's where area-of-effect spells from Chaos magic come in handy.