I did it earlier and it only took me a couple attempts. The key is to do as little damage to the tauren as possible while keeping yourself alive and just focusing on having the worm get it’s plates removed. The tauren calls rocks from the ceiling that stay on the ground and when the worm burrows it will periodically charge you. Just stand on the rocks that fall and it will charge into the rock and have it’s plates removed. Once it’s actually to the point that you can deal damage to the worm focus on that and cleave the tauren down a little bit being careful not to kill him with the worm at high % hp, otherwise you won’t survive the rage. I killed him with like 30% on the worm and no plates left and was able to burst it down through karma/fort brew/dampen harm pretty easily.
Played with serenity/faeline stomp. Main priority is never letting the tauren cast which can be tricky when trying to focus on the worm hitting the rocks but it’s not too bad once you get it down. Felt a lot easier than the legion version to me; chi wave/expel harm/faeline stomp give you a lot of self healing and you can spec escape from reality to get out for a quick heal too.