So I did this with my 2 groups I couldn't get the Bayles Mark's to work, but I 3 boxed the entire event on my first go withb2 mercs failed it on last wave tried again and messed the mercs up so I just had to try it with no mercs I did end up finishing it with zero mercs and just 3 toons I used sk, war, and cleric no deaths till the last group at the end I focused adds first then the mini bosses once I got all the adds down I ended up alternating tanking with the sk and warrior and would just completely heal which ever one wasnt dead, the second group of 3 box I suspended the mercs till right before the 3rd wave as it was easy until then, with the merca it was cake lol