Hmmm ? lost the genetic lottery?
Because he`s not Aen Elle. no such eugenic awesomeness for him!
I am assuming that there are different castes among the Aen Elle. The woman in the company of Ge'els was also of normal stature, as far as I was able to tell. I'm guessing that with all the genetic engineering they've been getting into over the centuries that they've developed specialised roles and those bred as warriors of the Wild Hunt are made giant in stature. Not everybody follows their birth-assigned role, however, seeing that Ge'els is huge, but still a civil administrator.
Furthermore, Avallac'h may be so old that his genetic background has not been tampered, at least to such significant degree.
Maybe Avallac'h suffered side effects from being turned into Uma, or enduring the Trial of the Grasses?
By the way, maybe I missed this in my playthrough. I remember someone (maybe Yen) saying that Avallac'h sustained damage to his nervous system or something after enduring the Trial of the Grasses. But I never saw this mentioned later on and he seemed fairly ok physically--I half-expected him to be in some kind of wheelchair later in the game. Was this ever addressed more?
I would also have liked to see addressed more (spoilers for 'Lady of the Lake'):
that Avallac'h was originally a very bad guy who, along with Eredin and Auberon, wiped out the pre-existing humans on the Aen Elle world.
He's a nerd! Eredin used to take his lunch money when they were in elf school.
I remember someone (maybe Yen) saying that Avallac'h sustained damage to his nervous system or something after enduring the Trial of the Grasses. But I never saw this mentioned later on and he seemed fairly ok physically--I half-expected him to be in some kind of wheelchair later in the game. Was this ever addressed more?
Nay, he did use the mask to conceal his "Uma-fication" through that curse. Guess this hilarious look would have raised many questions otherwise......considering he used a mask to conceal his identity...