IF U SEE THIS WHEN U SEARCH TRAILS IN TIANQIU ON TWT READ THIS (THREAD)
-use pyro and electro characters!! xiangling is vv good
-use potions that boost fire/electro dmg + cryo res
-use atk + def boosting food, you can stack food and potions! i used jade parcels + fishermens toast

-break the stone first then ig go for the slimes then archers , i did abyss mage last
-cryo is good for the abyss mage btw
the team i used was: xiangling lv 50 beidou lv 40 qiqi lv 40 traveler lv 40 (wl3)
it took a week but i finally beat it .. DONT GIVE UP!!!! U CAN DO THIS!!!!

++ i used xianglings guoba together with travelers elemental burst if u use traveler for this, it deals pyro dmg!!

im f2p but i realise that not everyone has qiqi,,, im pretty sure u can use kaeya/chongyun if u have him too! i only used qiqi for her skill to beat the abyss mage tbh. u can get xiangling from clearing spiral abyss floor 3 lv 3, her ult is amazing for this challenge!!!

any other electro unit is fine but make sure u have at least one claymore user to break the rock easily. even noelle is fine for this but make sure you definitely have pyro and electro in your party + maybe cryo if u want.

tl;dr - use pyro and electro. cryo optional but recommended. xiangling is god. stack atk/def boost food and potions. break stone first with claymore.
tbh i contemplated quitting bc of this quest... made this thread so nobody else has to suffer. Good luck to whoever reads this!!!