For me, the lightning wyvern worked best. You have to find a deathworm, wait for it to emerge from the sand, and start shooting it with the wyvern. Then, when it hides underground, you must sit on the ground and when it moves towards us, use wyvern push attack. After that, he should emerge at a safe distance to fire the wyvern again Important! Remember to keep moving backwards while on the ground, and push back approximately 5 seconds after the deathworm hides. I hope I helped <33