In my party Sagani has the Stormcaller soulbound to her, and has to rest at the lair of the Skydragon for the last upgrade. I've defeated the dragon and tried resting everywhere on the map, but Stormcaller just won't upgrade.
Save game file:
https://www.dropbox.com/s/iamm4ot1cvtklbl/f68fb128738542e6a53e08f0237168b3%2036944621%20TempleofHylea.zip?dl=0
Output log:
https://www.dropbox.com/s/he7tockbh7qg6ed/output_log2.zip?dl=0