Cavern of Transcendence Trial/Strategy
Since it is no longer necessary to click the Obelisks simultaneously, all you really need do is go down each tunnel and click each obelisk one by one. You may wish to work your way around clockwise or counterclockwise to make it easy to keep track of which you have already done, or if on a team you may wish to call out which ones you click as you click them so others will know not to duplicate your effort. ("First left, done!" "Second left, done!" etc.)
Some Obelisks will be free of enemies, but others will have enemies encamped around them. You may need to clear the enemies out before you can click them.
Remember that falling in the lava heals Pumicites, so try not to knock them in.
It is not actually necessary to defeat Koago to complete the Trial; simply defeat the two or three Pumicites holding Sam Wincott captive against the wall.