You mean the story quest where Zekhan says he will remember this permanent choice right?
We had a big thread some while ago and it was debunked that there was an appropriate seperate detailed warning about it: Character permanently ruined because I didn't know there was a choice on my main - #4 by Saneko-ragnaros
If you’d like the worn cloak toy, you can still get it, while it lasts but through another character and then supporting Saurfang instead.