I found a way to get to the ruins in Desolace, where you fly over sometimes.
You'll need Slowfall and no Walljump skills.
There you start:
Slowfall jump there:
Jump up there:
Walk this way:
Slowfall jump there:
Walk up:
Follow the way and Slowfall at the end:
Walk up and jump down
Follow the way:
Endpic:
/edit: looked if it's repost and nothing found.