Aslan_Red
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For me, heroes are the same when they have the same specialization (secondarily: skills and abilities), and how they look externally doesn't really matter; the main thing is that they resemble their faction, are noticeable on the map, and move quickly.
But that's just my opinion. There are other participants in the project who may have a different view.
And can't a dead Elf be a Necromancer?