I'm not one bit familiar with the Bosmers ability. You would have to explain to me this ability to " form the Hunt" to me. I'm clueless. How would that ability be able to own any werewolf pack?
If you want a description, this is the best I've found so far in any TES book:
Scotti followed them. When they reached the solid mass of living wood with only one gaping portal, Scotti could see a dim blue light glowing within. A low sonorous moan from a hundred voices echoed within. The Bosmeri maiden he had been following held out her hand, stopping him.
"You do not understand, but no outsider, not even a friend may enter," she said. "This is a holy place."
[...]
A flash of white fire erupted from every crevice of the temple, and the moan of the Bosmeri prayer changed into something terrible and otherworldly. The climbing Cathay-Raht stopped and stared.
"Keirgo," it gasped. "The Wild Hunt."
It was as if a crack in reality had opened wide. A flood of horrific beasts, tentacled toads, insects of armor and spine, gelatinous serpents, vaporous beings with the face of gods, all poured forth from the great hollow tree, blind with fury. They tore the Khajiiti in front of the temple to pieces. All the other cats fled for the jungle, but as they did so, they began pulling on the ropes they carried. In a few seconds time, the entire village of Vindisi was boiling with the lunatic apparitions of the Wild Hunt.
This is from "A Dance in Fire", volume 4. I'm aware that it's "just fiction", but considering that this story is playing (and partly describing) other events which took place I daresay it's accurate enough. (The Cathay-Raht are a force of Khajiit which invaded Valenwood in the Five Year War during the 3rd Era.) These powers are beyond physics, and so far there's no magic that can stop them either.
Not sure whether this ability is truly connected to Y'ffre only, or ancestor spirits, or goodness knows what, but these two letters from TESO mention Hircine as well:
One Bosmer's Response to the Dominion
The formation of the Dominion can end in only one way: with Bosmer necks under High Elf boots! Those arrogant bastards will subjugate all of Tamriel if they could. I won't stand for that, and none of you should, either.
It's time the Bosmer reclaimed Valenwood. Blacksap or Camoran loyalist, Green Pact stalwart or oathless salad-eaters—it matters not. We'll simply need time, strength, and powerful magic.
Appealing to Hircine may provide us with what we need. Risky, yes, but with great risk comes greater reward. For Valenwood!
-Calahawn
What Comes Next
You won't regret your pledge to help. Together, we can reclaim Valenwood for the Bosmer!
If you're reading this, you should already have the requisite list of reagents and know what to do with them. When ready, seek a quiet corner of Grahtwood where you won't be disturbed. Perform the ritual when ready. It's simple—elegant. As Valenwood was before the Dominion polluted it.
Hircine will hear our call! The more who call out to him, the louder our voice. Together, we'll hunt—until all left in Valenwood are Bosmer.
—Calahawn
