Yesterday I attempted to do the adventure of Jenn the Locksmith quest where you have to kill 4 red crocky guard to save her brother. I stayed inside for the entire hour and I couldn't kill them. I used 2 appos for nothing. Today I tried it again. and managed to kill them in 30 min. I used the same spell, same equips and did approximately the same dmg as yesterday. I recon there was a bug yesterday where they couldn't be killed. There seems impossible that I somehow do double the damage day by day.
What class were you? It could be that your first stay attacks kept switching which mob you hit and the others healed while your second day attack focused more on one target and so the heal couldn’t keep up.
They take half damage from blizzard and heal ~10k hp/second, so it sounds like you're very much on the threshold of outdamaging their heal, and even a tiny damage increase could make a huge change here.
Im just highlighting this, I did the exact same procedure 2 days in a row and first day couldnt kill. Second day in 30 min. I didnt change anything in setup or pots. I just find it weird it changed from one day to the next. Like literally got kicked out of the map after one hour and logged out. Then next day logged in and went straight into the portal and done in 30 min. I dont know. I just reported because we are supposed to. I aint fased about it anymore.