[Jobobn]

Update: Did more testing with this bug, and found the actual culprit.

Turns out that the Bag of Runes is not causing the bug. What does cause it is the existence of phantoms on the battlefield.

Essentially, the Rune Mages' Skills (Create Phantom, Runic Word, etc.) will not update their charges to reflect their actual number of runes so long as a phantom is on the battlefield. This is why I was getting inconsistant updates with their number of charges. When the phantoms they created expired, it would then update their skills, but not before.

If it helps the devs track down this problem, be aware that this problem did not seem to exist when the game first came out. I had preordered the game, and used the Rune Mages extensively then, and this problem had not arisen to the best of my knowledge, so it was most likely introduced in a later patch.

This is a more mitigatable problem, but still very frustrating. I hope this helps anyone else who runs into the same bug.