Often during events or when a zone is new, the strategy is just burn stuff down with a couple dozen players. But I've noticed this boss when trying to solo or fight with only one or two others is almost impossible. So I feel like I'm missing a trick (or I hope I am at least).
It feels like zos can't design a challenge without making enemies ignore what we are used to from combat in the game. i.e. trying it with a NB, the adds knockback/fire thing ignores invisiblity. Tried it with Immovable pots. They ignore the CC immunity for that. Which didn't surprise me since they ignore CC immunity anyhow and chain CC you with knockdowns and damage that nearly one shots you from one hit. I've tried focusing adds first, but they respawn. I've tried ignoring the adds completely from some advice, but they still do their attack eventually.
Best I've done is endlessly dodge roll with a stammy and even then I'm low on stam and don't have much left to actually fight. Or trying to spam shields, but on a mag, the hits will drain your stam if you block and if you don't, you get knocked down and can't re-shield future hits. So aside from a couple fights that worked out well b/c of perfect storm of the couple other players drawing more aggro from the adds and me not having to deal with a lot of the fire things they shoot, I don't feel like I've figured out any consistent way to fight this boss on a DPS by myself or with just one or two other DDs.