serovoy
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If I'm not mistaken, the "spell power" parameter doesn't affect Thunderbirds, so the "Wrath of Blood" bonuses from Sky Daughters will be practically useless. However, this is easily fixable – just give them different bonuses.
There's also the option of using the "Titan Bolt" spell (focused damage instead of area-of-effect), which is easily customizable. Or "Storm Strike," like the ones used by Trolls 1-3 times per battle.
P.S.: I didn't vote in the VK poll because I simply don't know where, so I'll post my answer here: Sky Daughters – option #3, Archers – option #5.
There's also the option of using the "Titan Bolt" spell (focused damage instead of area-of-effect), which is easily customizable. Or "Storm Strike," like the ones used by Trolls 1-3 times per battle.
P.S.: I didn't vote in the VK poll because I simply don't know where, so I'll post my answer here: Sky Daughters – option #3, Archers – option #5.