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The MHW wyvern gem is an obscure item needed to craft some of the game's highest-level gear. The gem is a scarce item only obtained through defeating certain monsters and is dropped randomly. It is difficult to find and presents problems for players trying to craft high-level armour and weapons. The chances of getting the item depend on the type of mission and how challenging the task is. You can also obtain the gem through one optional questline called A Fiery Convergence. You must obtain the item to take full advantage of this monsters amour.