Transmog bug?

Hi, idk if it’s the good place for that for the transmog Regrown Osteowings are from a quest, but there’s no information anywhere about that quest even on wowhead they dont know, can you help me with that like what is the quest name or where it start or wtv would be rlly appreciated

if you look at the Necrolord Transmog page, there is information available.
it says you need to complete a quest to obtain an item which spawns the boss to drop the wings
(not sure how accurate this is, but that’s what it says)

there are also 2 other color variants available

I know that lol, but which quest that’s the question and there’s like no answer about that

Regrown Osteowings is a reward from doing Iron Phillip’s weekly quest after hitting rank 5 Abom Yard