By dragging these bosses to the entrance of their building, it's possible to fight them while completely ignoring the constellation adds. Syzygy will still spawn and attack, but that's ok because both of the bosses should die before the add catches up. By that point the raid can just focus it down without worrying about the two bosses. Afterward, the encounter is considered complete and loot is available
#Nadir/Zenith Cheese
languid field
languid field
You can also do this with Vitheo, but the corruptors will aggro all of the adds in the arena which will lead to a bad time