Looking for Wolfstar Fic Kinda Royal Fae Quest

Okay, so a while ago I read this Wolfstar fic where I'm pretty sure it was a royal AU, but I am not 100% certain. They were on a quest alongside Regulus and James I believe, and in those quests within a forest the forrest would give each of them a challenge, where they had to succeed, from what I remember the challenges were to overcome personal things such as fear, traumas etc. I remember very vividly that Regulus challenge was involving water and he almost drowned. From what I remember, all of these challenges would allow them to go deeper into the forest. I do believe that Remus' challenge involved doors and a key.

I don't remember much more about it, I'm sorry if all of this sounds very scattered brain. Any idea of it would be helpful! Thank you sm!!