definitely time based. we had a 2nd wave spawn before we even got name to 99 because we pulled a long way. also adds are immune to mez. small details. 2926 was highest an add hit me for. so that much was right -)
Adds are immune to changes in run speed and they are resistant to mez. We had to evac out because the adds were whoopin on the healers. VERY tough fight indeed.
I dont think its time based but im not certain. Pulled this mob and adds didnt pop till it hit 75%. well considering i was moxing with my war/sham i wiped. came bk a bit later and it was still up. Decided to forego defense discs since the name isnt all that hard and hit furious disc+ every dps aa to mow down the adds when they popped and just spam heals with shammy. with this plan i pulled the mob again not realizing the adds were still up. killed one merc before i even got bk to the camp. managed to kill a few adds befor it popped its actual add spawn at around 75% hp wich got me a total of about 9 adds. KOed me pretty quick. will wait for help on this one!