Triad of Elements

Strategy
When you begin the fight, there is 3 root named Ragecrusher, Ragefroster and Rageburner. Only Ragecrusher is mezzable and should be to avoid him to send pets. Around the scene, are banners, one for each named. From these, bubble "Essence of" go toward the named. They must be killed, otherwise, when arriving at there named, an nasty AOE will be launched. If killed, a crystal will pop on one member of the group and must be place near the banner : the corresponding named will take a great damage. No need to fight the 3 named, just the essence must be done. When the 3 named are down, the 3 banners must be killed and when done, the 3 will fuse into the Triad of Elements.

This as a lot of HP and will cast regulary a great healing on himself by around 50% (not interruptable).