It had Tony as some sort of god or deity that got stronger when people prayed to him. I remember that towards the end they were gearing up for a war of some sort and I think Asgard came to Earth to help out (or fight agains them, idk, they were fighting at least). I also remember a scene where Tony were sick or weak and Steve and Clint helped him heal by believing. One of them was his warrior the other his priest I think, I can't remember who was what. I don't think it had any pairings actually. I do believe the fic was completed but I'm not sure but I do know it was multi-chaptered.
Does anyone recognise this?
EDIT: I found it myself! I forgot I sometimes read fic in other languages. It's Il souriait by aerial and it's in french. :)