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Hmm... how do you even play as Elves? :)
Wind Dancers are more useful at the beginning, against neutral creatures.
Because they definitely don't cluster together, and there will be fewer losses due to their ability.
In the endgame, however, Death Dancers are usually more useful.
Especially with teleportation.
Especially under Gilraen.
Especially with generals.
Who is forcing you to rush them headlong into enemy fire, exposing them and letting them die? And then you still say that the unit is bad...
You probably have never seen how these dancers, under the cover of their troops or with teleportation, with Forest Fury, Retribution, Blessing, Smite, Haste, with upgraded defense and resistance, unexpectedly appear behind the enemy, among several units, even among archers, and just start cutting everyone down.
The opponent can't even properly touch them, because the counterattack will be simply devastating...
As they say, you just don't know how to use them properly.
And in general, Death Dancers are my favorite unit in the game