If you want to het a lot of deathworm horns, go to the northern duines. Use the orbit camera to look underground where they are. Then put some oil jars on the gruind and set them on fire. Get the deathworm into the burning oil and bite him a view times with a high level hunter, like a direwolf. Then run away. If youre in luck, it wont hit you. If it does hit you, dont let it hit you again. If youre just out of the reach of his attac, get your crossbow and set him with flame arrows on fire. Do this a view times. It should die fast. Do this with more deathworms and get yourself some black pearls and deathworm Horns.
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 ... :/
You find these things in the open part if the desert in Ragnarok. You really just need a good level Thyla and you should be fine. There a bit overrated, trust me I used to live in the desert. Mantises are tamed with Deathworm horns.