Tony and Loki are for some reason stranded on Jotunheim and I recall them setting off into the depths of Jotunheim (also recall issues with the Iron Man armor). I think they end up crossing some frozen lake and ending up inside the palace? And Tony is injured in this journey? Possibly on the run from frost giants? **edit: Loki and/or Tony was being tortured by the frost giant leader in the palace in the last chapter i read.
I'm not sure if this was a wip or if I just don't recall the ending. Does any of this ring a bell to anyone? I thought this was a longer multi-chapter fic but I may be wrong.
I thought this was the fic Boreal Involvement, but that only starts on Jotunheim and quickly returns to Earth.