The drop rate for the Dragonbone Vale Alloy is too low. I've now done 29 dragon heads in a row before I finally got an alloy.
That's 1 of 50 towards the new weapons. 3 hours to make 1/50 progression - that's far too low. You should at least make a guarantee that after 12 there should be 1 drop. This way players know that they'll be guaranteed the weapon set with 50 hours of work max.
You're introducing too much player frustration without a means for the player to solve that frustration.
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I personally would complain about getting Ancient Dwarven Materials. For dragonhead, at least, you don't need to compete with other players. For Ancient Dwarven Materials, you need to deal with spawn rate, other players and drop rate.