I was in the process of doing this quest when I left to go do Dungeons with my Guild. When I came back I was unable to loot the Regenerative Magma needed for the quest. Tried Again the next day still no luck. Dropped the quest, did the other objectives, and tried Molten Core again still not able to loot the quest items. Submitted ticket US77453223 and they said it was hot fixed. Tried again with still no luck.