They're called the refti - they look like sethrak but are made of stone, and may well be what the sethrak were before becoming organic in the same way the earthen preceded the dwarves.
WHAT CAN THE HARVEST HOPE FOR, IF NOT THE CARE OF THE REAPER MAN?. - Terry Pratchett, Reaper Man
WHAT CAN THE HARVEST HOPE FOR, IF NOT THE CARE OF THE REAPER MAN?. - Terry Pratchett, Reaper Man
Yeah, that's possible, I also thought that Sethrak may truly be a giant snake that either turned into or assumes the form of a Sethrak. There is a giant snake skeleton in her dungeon after all.
The Refti are mentioned to be sculpted "in the design of Dragons" which explains the horns, but not really the snake-like traits. I would hope they are supposed to be proto-Sethrak but it could just be a model reuse because they know Sethrak are popular.
There's a lot of possibilities, really. Perhaps some refti exposed to the Curse of Flesh fell in with a snake Wild God who altered their forms somewhat, who could've been the namesake for the later sethrak. That might also explain Sethraliss, who perhaps took over for this Wild Goa/Loa on the occasion of its death, taking in its essence in the same way that Vol'jin took Rezan's essence in Shadowlands, leading to her change in form and perhaps that of the later sethrak.
Alternatively, the refti and sethrak are just two distinct races who happen to share a lot of their outward appearance, just with one being serpent or dragon-based and the other being more snake-like.
WHAT CAN THE HARVEST HOPE FOR, IF NOT THE CARE OF THE REAPER MAN?. - Terry Pratchett, Reaper Man
This is most definitely some 10.0 stuff we might see with more renown unlocked or by doing the new raid.
No, she's a Loa: https://wowpedia.fandom.com/wiki/Sethraliss. Though she may have looked like a giant snake, who could change form into a sethrak; "While Sethraliss' avatar resembles a sethrak, it appears that the loa's actual physical body was simply that of a gargantuan serpent, judging by the huge snake skeleton that can be seen winding through the Temple of Sethraliss and culminates in the Skull of Sethraliss in the Bazaar of Watchful Eyes."
Amazing sig, done by mighty Lokann