Oldtimer said:
you realize even if originating from same strand of DNA, due to X nr of factors,Projenitors of that base DNA can and most likely will evolve/change/mutate in different ways if you put thos Projenitors in very different enviroments.
also this is not just speculations, i can observe it my the area i live in aswell, about 30 km from the area i live (hills) there is the mountain area, the ppl in the mountain area only consume salt with No Iodine (which they mine themselves), due to that they have a more pale color than us in the hill zone, also their foreheads are way bigger than ours, even tho our people are like 20 mins drive with the car (due to bad roads).
the same goes with people in the south of my county in which most have a more darker skin colour due to more sunny weather, while those in the north are more white-ish.
some in the North-East even talk way different than use and have different customs and ways to behave that others (even tho we came from same people and distance is not that big)
now to Perisno elves: they live in the forest = most likely they adapted to the forest, rememer medival hunters/trackers which had keener sense that most, could track animals etc.
while the 3rd Legion were most likely in a whole different enviroment which is why those 2 factions evolved/changed/mutated differently.
Look at the Roman Empire of our old age, and see how various armies in the far corners of their empire changed, or how Rome Itself changed due to X influx of new DNA/Customs/Technology.
or better yet look in our days, compare someone who lives in the city for 2-3 generations and see someone who lives in contryside for 2-3 generations, you will be amazed of the difference on adaptibility of those 2 people from different enviroments.
ps: i`m a dude, and by no means do i have the requirements to be a "Sir" (meaning maners wise, not age)