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I think the only issue is that there is no confirmation that Blue Eyes can happen again, cause when green eyes got cleansed, we got Golden eyes, instead of golden and blue.
So the implication is that blue eyes for blood elves aren't a thing so far.
Does it mean that the Light energy will always take dominance in terms of showing as eye color?
Or does it mean that blue eyes will just take a bit longer to come back?
We don't know, hence the lack of confirmation, but I do agree that there are plenty of reasons why RP wise a BE could have blue eyes.
IMO that's the question; is the light energy supposed to be more "corrosive" and the reason of why would it "override" the possible blue glow? Cause if they were the same in strength, we would already have blue and golden eyes.
Hence, gold will always take predominance, or, arcane blue will take a while in coming back.
See I always figured it made no sense why blood elves re restricted to a single eye colour. No doubt not everyone is using energy from the sunwell just as not everyone was using energy from the fel crystals. Mages don't use holy or fel energy to cast their spells they use arcane so surely that has to come somewhere. Given how sensitive they are to types of magic mages at the least should still have blue eyes; no?
The only way I can see it overriding the 'blue' or 'green' is if they specifically focus their magic in holy magics like priests or paladins for instance. That is just my two cents on it though.
Indeed, like in matter of personal opinion I agree with what you are saying, it would be nice if BE eye colors were related to the type of magic being channeled, like it "dyes" them on repeated use.
The issue I see is that all the evidence we have so far points otherwise, because with how it appears, it's less about the type itself of energy being channeled and it's rather about the radiation level of a specific source of power that affects the population across the board.
Like, you don't get blue eyes for channeling Arcane Energy, you get the Blue Eyes because there's a huge fountain radiating that energy, seeping it through. That's why all blood Elves got green eyes, not because everyone was using fel, but because the radiation caused by fel crystals and other fel energies to power the city/settlements
So I think that's the thing: The radiation of the power source -The Sunwell- is what causes the eye glow, or at least what has the "predominance" over personnal channeled magics. And so far, we have seen that the predominance of the Sunwell itself is Holy Light radiation, cause otherwise, blue eyes would have already returned.
So we are back then to the possibility of:
A) The Holy energy of the Sunwell will always be the dominant and Arcane recessive thus never show.
B) Individuals casting could "tip the scales" of that homeostasis and give the more Arcane attuned Blue Eyes -Cause it's also evident that personal lifestyle is relevant, as it has given BE a threshold between green and golden eyes which would suggest that how "attuned" one is to the Sunwell affects your eye color, so the question is if the "how" is also relevant-
Cause how it stands now -as in, the present evidence- It really implies that Holy energy is dominant and thus Holy > Fel > Arcane -cause otherwise, Blue eyes would already be back-
Mind you, this could be easily retconned by the "Yeah since the Sunwell is Holy/Arcane you get affected by the radiation you are more attuned to" So it's not like a Big Deal tho, I'm just talking about the speculation with what facts we have.
So in short, I think the evidence implies that Blood Elf eye color as a "permanent" trait is less about the energy an individual channels and more about the dominant radiation of a power source