The last boss is horrid. 10 years later, we do so much more damage compared to ARR that it's torture everytime you get it in roulette, especially with new players. You have to stop DPS entirely after the 2 adds or the boss will Blood Raid right after you start targeting the add.

Either give the boss more HP or change the mechanic to something time based rather than % based. Being punished for killing the boss too fast is ridiculous.