Use Sword and a mastercraft shield. Block worm's attack, then attack it twice and put your shield up quickly for worm's next attack. Rinse lather repeat. If you get knocked back too far the sword won't hit. Maintain push towards the worm to stay close while shielding. Practice the timing. When looking for them. Go on foot. They will find you. When u see a dust circle on ground in front, put your shield up for worm's surprise attack and jus keep up the pattern I mentioned. You can it twice after every block. That's how its done on foot.
Doesn't anybody think that on dodo dex you should be able to see were the creatures live or are most common at? I've spent an entire day looking for a thyla and never found one. By the way I did even look in the red woods still didn't find one
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.