And all of this anti-nature agenda seems to fit well with Hircine's common wish for the hunt without limits- which the forsworn could be displaying in their 'trophies'.
It's not "Anti-nature" in TES to use the resources Kyne provides. Even if they seem to be completely counter-intuitive, such as by murdering and "desecrating" Spriggans for their spirits/Taproots. I highly suspect the "Old Gods" are the Et'Ada themselves - Aedra and Daedra are alike to them, the difference being that Daedra are cast to the far reaches of
Outer Space Oblivion like Lovecraft's "Outer Gods", while the Aedra are trapped within the world, like Lovecraft's "Elder Gods". The dieties of Nirn
are shaped by Belief, after all. How can a bald, four-armed, reddish-skinned towering humanoid among Men be a kitten in Elsweyr?
Magnus is not the only source of "Magic" in TES.