I think i discovered a way to stack even more damage at bosses, (sorry if this was alredy know , but i never saw anyone commenting about this, even though i play since the original queen's wrath event) I used warlock's bomba nova at golgoroth's chest, this seemed to stack together with the titan's weapons of light, giving every guardian a second bonus on their attack power. Actually its more like golg's defenses were downed I have to test more if this really gives a buff, but each time i did this we got an insane DPS. Possible downside: if the bomba is too close to the titan's bubble , it caused the bubble to disappear too quickly