It all depends. Focus on adds when they spawn. Teamwork and communication are key! This week its primary weapon damage preferred so it's easier to take out adds. They spawn at certain health intervals and once they spawn you must stop damaging skolas and focus on their removal. Also mines will spawn at 50 and 25% health. In the beginning you'll need to move left and take out the ghost servitor before any damage can be dealt to skolas. They spawn throughout the map. One must be destroyed for any damage can be dealt to skolas. Once he reaches 75% health the bond will be broken and you'll no longer need to kill a servitor. Once this happens skolas will taint a guardians light with an essence that must be passed between teammates every 25 secs. If not whoever has it will perish after 30 sec. Once the essence has been taken from someone they are immune for 35 or 40 secs so it must be passed between all teammates.