You only need a megaterium and kill a insect before 120 seg because dirime theis time the megaterium has 250% plus of damage and he recibe 75% leas damage is perfect for kill everithing except golems and wyverns(they fly)
Ragnarock - Go into ice cave and kill the weak deathworms there. Use a good shield to block their attacks and melee them with a sword, easy quick kills because they have so little health and they drop the same loot as a regular deathworm. Make sure to wear warm cloths.
I used a Rex to kill a Deathworm a few minutes ago...
For your assessment:
My Rex had 300% Melee Damage and 10,4k health
After our battle he had around 5k health left and I was able to kill another one because I forcefed him until 7k hp...
Don’t underestimate this worm ... :/