With all the information that came can we now assume that demonhood is a condition that you become after dealing with fel and demonic magic? So any race can become demon like being undead. And no race is actually demon itself not even the nathrezim.

Quite possibly. Seems like every few expansions more and more races that were once originally demons turn out to just be fel corrupted and have other origins.

But as long as not all of their origins have been retconed/expanded, we still can’t say that there definitely are no races that were always demons.

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