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The special ability of the Dwarves and Elves is quite decent; the Necropolis ability works great against Humans due to Empathy, it's a great ability for the Inferno faction, and most importantly, all the necessary skills for it are useful.
The special ability of the Dark Elves is very debatable; it incredibly strengthens the Sanitarian, but the problem is that the Sanitarian is a hero for fast-paced gameplay and is no longer effective at such high levels as 25.