BUG

When I reached Chapter 3 of the story mission and entered the map "Lava Treasure House", I couldn't obtain the mission item "Hammer of Kamasa" after defeating "Kamasa". I've tried it seven times already, and it's really frustrating

I had the same bug I think, nothing dropped at all and I can keep fighting him every time the instance resets

me too , yes i think bug , the bost dint drop the hammer at molten vault