I haven’t found a guide anywhere for doing this task efficiently. Let me know if there is a place that has guides for completing annoying tasks like these. I heard that Diablo’s task 14 can be done with Diablo on the bench but that’s not true for Xyrella.
Are there certain PvE opponents where you can stay in a continuous loop? Ex. enemy mercs heal themselves in between attacking so you can heal your own mercs and continue for a long while. Also, is there a good way to increase the amount of healing Xyrella (or any merc) does?