You are trolling if you are not using essences and actions in Delubrum

[Vahlnir]

They did, however, make the "enrage" phase on the final boss really uncomfortable to deal with for a prolonged period of time and I've almost wiped in low DPS groups because the healers couldn't keep up with the amount of damage going out.

What gets a lot of people at the end is the debuff with the countdown timer. It took me a few runs, but I realized that the countdowns weren't always the same, meaning that I had to stand in different places depending on how long the timer was and move accordingly, then stop doing anything when I get into position. That mechanic, along with the gates, tends to trip people up pretty regularly. Personally, I'm just now getting a better understanding with the gates. There's a lot going on in that fight.