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When I was voting, I thought it was about the factions in Heroes of Might and Magic. If it's about the factions, then:
1) Elves, 2) Dwarves, 3) Necropolis, 4) Inferno.
Now, about the racial ability:
1) Inferno (it really helps with the early game, plus Hellfire:rolleyes:)
2) Fortress (runes are very powerful)
3) Necropolis
4) Warlock