Pulsar is one of the new affixes this season, being the rotating orb around players that have to be soaked by teammates.
Problem is, with this particular boss, youre constantly forced to spread out to deal with his mechanics, and you can guess why this doesnt quite work with the affix that forces people to stay close.
So, might have to do something about it, cause otherwise i would almost advice people avoid this specific dungeon during Pulsar Weeks, unless youre healer is REALLY good to compensate for the boosted dmg from the boss, this of course, also applies the tank being able to survive on their own too.