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Most of the damage from the fight comes from 1218308 turning the candles back on. You can manipulate the amount of stacks this debuff gets you by manually turning candles on with 421638 or off with 422700.
This is how the boss works:
- The boss will do 425394 extinguishing all candles and doing heavy damage to the group
- Three people will get marked by 421638, dropping circles of fire that can turn candles back on
- 1218308 will be cast, turning on all currently extinguished candles and giving the group 1 stack of the dot for each candle it turns on
- The 422700s coming from the boss and aimed at players will turn off any candles they hit
- Another 1218308 will be cast turning back on the candles the boss just extinguished
The whole cycle lasts around one minute before repeating again. Every time 1218308 is cast the group will get stacks accordingly to how many candles got turned on. The idea is to turn on as many as you can with 421638 so you get as little stack as possible, and then aiming the 422700 to turn off the fewest possible candles so the following 1218308 gives fewer stacks as well.
There is also a dangerous overlap right as the cycle resets, when your group is taking damage from the 1218308 stacks from step five and right as the dot is ending the group gets hit by the 425394 from the newly started cycle. You need to keep this in mind and have a good plan to heal this, usually involving lb.