The boss really isn't pure luck. It took us like 5 to win, but that was because of unlucky incidents/crappy pull mistakes.
The first time we didn't know where we were going so we took too long and ran out of time.
The second time we still didn't have time down completely and rushed ourselves and it just didn't come together.
Third time we got the boss, but everyone lagged out during the fight because they didn't listen when I told to turn off effects, people froze up from the sudden spawns, including the bard who was supposed to sleep the Malboros. They raped us.
Fourth time a melee engaged too soon even though we set a time for stunners to start, and singlehandedly ruined our entire run which was flawless up til that point.
By the fifth time we worked out all of the kinks, we got the pulls down, people configured their PCs to deal with the lag, and no one screwed up on the megaboss. BRD slept the malboros and the MB died in record time.
I'd say she has around 1/2 of the HP DL that deal does, just dies a hell of a lot faster.
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