So.. bit of a theory here, because I haven’t watched much and someone pointed out that the void has overpowered the fel in the blood elves.
I guess with the events in Antorus, nothing can fuel the fel to its power anymore. Sargeras is imprisoned, the source that kept bringing demons back is no more. Fel was built to destroy the void, but it was built. It wasn’t existing. It was the most volatile and primal source of arcane mutated on the lives and souls of mortals. But now that’s not happening anymore.
So does this mean fel isn’t the most potent and powerful magic anymore? And that the void is overcoming it?
I see it like this. That lore is outdated, and it’s being updated, and people are upset about it because it’s still vague. “High elf eyes change to the most potent magic in their system,” and we were always told fel is the most potent, volatile, latent magic because it’s the building block of arcane but mutated. However, we’ve seen undead elves that were risen due to necromancy be around fel and be completely fine because the necro magic is more potent despite being made by the Nathrezim.
But we see a Nath purified by Xe’ra, and it makes you wonder if the Light can purify something like that, that it has the power to unmake and purify Illidan- it can do that for the blood elves. And since fel doesn’t seem to be thet most potent, or shouldn’t because there’s nothing fueling it anymore.. that means entities of pure, unadulterated void or arcane can probably do the same as Xe’ra. OF course that won’t happen to the player character, but it gives a nice outlook that fel can be erased.