Comment by varenne:Scrigno del Calca Nubi is located on the small floating island north of Elysian Hold in Bastion.
To open the treasure you have to make a series on jumps on the clouds.
Or use the glider from the cliff.
In Bastion:
/way 57.93 18.52 Clouds to Jump (Cloudwalker's Coffer)
/way 61.04 15.11 Cloudwalker's Coffer
Video:
https://www.youtube.com/watch?v=PkfR5MlDVUE 