I just started playing the other day so I don't really know what I'm doing. Started as lightning sorc, switched to hard as soon as I could, I'm very weak and have to kite even common enemies and everything takes forever to kill but I'm having fun. Fought a couple bosses in random dungeons, very hard and died a few times on each but I eventually beat them after having to kite them around the entire dungeon for like 40 minutes. I know it's dumb but I like to play like this.
But then I hit a wall doing the legacy of the magi quest. I couldn't beat the boss at the end (I know the boss isn't part of the quest, I just wanted to beat him). I took way too much damage and couldn't dodge all the random projectiles, and couldn't kite him like I did the other bosses, so I just ran out of potions and died on every attempt, couldn't even get him to half health after many attempts over like 30 minutes.
I gave up and warped out to turn the difficulty down, but it said the dungeon would reset so I decided to just change my build and try again. I was like level 20 and using a level 16 legendary dagger. I switched to a level 18 legendary staff, and respecced from chain lightning into frost orb. Went back to the boss and melted him in literally 10 seconds. I just shot frost orbs at him while facetanking all the projecticles. I had to double check to make sure I didn't turn down the difficulty somehow, but it was still on hard. Did the change from a dagger+off-hand to a staff really matter that much (keep in mind they were close in item level), or is lightning just that weak compared to frost?