I went to Valkoth and got both quest at the same time and not sure if they were given info in the proper sequence.
Anyway, the fact that you have to gather material around mobs 20-30 level above you was challenging but feasable. The second part about the splinter's, killing mob's 30 level above you for a game that is basically "solo adventuring" is out to the looney bin. As such I say the quest is bugged , or at least unbalanced ... asking a L50 dragon to kill mobs L65-92 is non-sense.
If it wasn't of someone telling me that I needed to speak to Toreabel for the bar reciepy, I would never have been able to make them. Somewher in the text Valkoth or Kelakhan should send you to see the master in Kiransac first.