So I ended up losing connection from the game on the quest step after showing Hahasako the Heavy warded pot key item. After logging back into the game, the key item was no longer in my key items bag, much less anywhere else.

Pretty much tried anything one could think of, even back tracing through all of the previous quest steps to try and see if I could re-obtain the item somehow to no avail. Currently stuck on the step for showing the key item to Lamberteint now, and am unable to progress the quest.

Haven't been able to do much other than level alt classes for a week as I cannot progress my character any further or access Heavensward at all for that matter.

I submitted a bug report several days ago and submitted several ingame GM tickets only for every one of them to refer me back to the forums without being able to fix my character so that I may continue. Currently that bug report is sitting in the Accepted section.

Any assistance is appreciated.