Back into Diablo 3 for Season 13. Doing the Shadow Bane's set piece dungeon for the Demon Hunter. There are two masteries to complete. One requires using Shadow powers on a number of enemies which was pretty easy. However the other objective was to complete 5 consecutive Impale combos, which was a lot harder than necessary because you couldn't use Ricochet rune for the fear of running out of monsters to do your combos!
As frustrating as it sounds, it took numerous attempts and finally completed after 1.5 hours!