Best Place To Grind/loot Run For Blue Masks?

Help me out fams I want to get rich with my insane id luck by id'ing blue masks
only problem is idk where the best place to farm them would be

hit me up~

 

ToL, herb cave or Jungle loot run

 

The best place is in the CoW cave where you drop down into the slime and he summons a bunch of warriors. Once you defeat all the corrupted enemies, you can run back to the slime, jump in, and climb back up. CoW will then summon another gigantic horde of minions, and you can spam this as much as you want. The enemies are all level 60-75, making it the most time efficient method to farm legendaries around that level if you don't have mob totems.