I suggest putting tons of melee damage and stamina into a lighting wyvern if you have one. Then go out and look for a deathworm which can only be found underground then agroed to come up and fight in the desert areas of Scorched Earth and Ragnorok. Dont worry if you dont have that high of a level wyvern. A 100 would be good and besides deathworms only spawn at level one or at least thats what i have noticed.Once you are ready, go to the Deathworm and kill it once that's fine
go to its inventory and collect what you deserve.