I found a possible explanation for the Rhya-Ulric connection in Heidi's myths. Searching the thread for mentions of Lupos I found this quote by Boney regarding the creation of the dog:
On a sillier note, there's a rhyme called 'Old Wolf White Back' that's central to the canonical theory of Lupos and Ulric. This is a song about Ulric cutting off a wolf's head, and it's theorized by a Sigmarite to symbolize the defeat of (the Cult of) Lupos by (the followers of) Ulric, but I want to draw attention to the very end of the rhyme.
IRL, dogs were invented 20k years ago at most, which in Warhammer would predate the Old Ones, and happened 280k years after humans started existing. How did Warhammer humans speedrun dogs? Old Ones? Rhya? WFRP 4e: Lustria page 80 mentions an elven mage who breeds capybaras with Ghur, so maybe magic was involved?
To which @Andres replied:I can't really answer that for GW, but I would turn a questioning eye towards the Wolf God Lupus, theorized to be the original God of the Cherusens, and His defeat and the usurpation of the canine sphere by Ulric, who is unquestionably a God of Humanity.
Is it possible that Boney took inspiration from that and cast the creation of the dog as an Ulric-Rhya team effort? This wouldn't explain "why" Ulric and Rhya are siblings, but it could explain why that fact is suppressed in modern times. I believe the modern Cult of Ulric doesn't tell the story of Ulric beating Lupos, as in canon the defeat of Lupos by Ulric is only a theory (though it's theorized by at least two different sources, which perhaps suggests it has something to it), and according to Mathilde's rarer Ulric books the question of dogs and their relation to Ulric is a matter of debate in the Cult. If the myths involving Rhya and Ulric also involve Lupos and Ulric, and if the latter connection is suppressed because of its possible implications (chief among them the possiblity that wolves didn't originally 'belong' to Ulric) then perhaps that's why Rhya and Ulric being siblings isn't widely known?Archives of the Empire 3, the biggest source of lore on Rhya, implies she's responsible for the endoggening of the wolf. Belthani myths say she gave "domesticated grain" and tamed animals, and a contemporary myth says her handmaidens gave tame aurochs and secrets on how to tame the wild. Main problem here besides being 4e is that the first paragraph of this page (66) is entirely dedicated to talking about how unreliable all her lore is. That said, domestication and taming of animals is 100% within her purview, and she's old, so I think she's a more viable candidate than peasant-eating Ulric for who made dogs.
On a sillier note, there's a rhyme called 'Old Wolf White Back' that's central to the canonical theory of Lupos and Ulric. This is a song about Ulric cutting off a wolf's head, and it's theorized by a Sigmarite to symbolize the defeat of (the Cult of) Lupos by (the followers of) Ulric, but I want to draw attention to the very end of the rhyme.
So, Old Wolf White Back howls out loud after its head is chopped off. Kind of odd! You might say that this is stupid and looking for plot holes in children's songs is inane, and I would usually agree except that one of the only other substantial mentions of Lupos in canon is a short paragraph about a valley sacred to Him in Hochland, where "it is impossible to kill a wolf within the valley, no matter how badly you wound it." Is the rhyme actually a refrence to the immortal Lupos wolves that keep going even after you cut off their head???The Rhyme 'Old Wolf White Back' said:Old Wolf White Back
Old Wolf White Back prowls the hills,
Belly craving fresh new kills.
Bloody Blitzbeil wants him dead,
So, it slices off his head!
Old Wolf White Back howls out loud,
To the cheers of Ulric's crowd.