If your overlord Kyros conquered some land that Elves have cores on, you will be able to "elvernize".
If they really meant what they said and evil won then we should be able to kill whoever and whatever we want as long as it helps the evil cause. But I guarantee that there will be PC restrictions placed on the game where we can't kill based on age, race, sex, orientation etc.
Why do you all want to exterminate the elves?
Even better, maybe they're obsidian skinned dark elves! Oh and they've already exterminated humans so you can't choose them in character creation!
the map has a race called beasts on it, it implies there's atleast one sentient race, though not elves, cat people are number 2 on the murder list