Nexus Pretty straightforward. Minotaurs around the boss are a pain but drop down carefully and immediately behind you is a gap in the wall that you can all fit in. Pull them over one at a time and kill them. Leave 2 guardians in there and one on the ledge to the right as you look out. There is a nice little hollow that means you can attack without dying too much. The two in the gap can also dps the boss but can also thin out the adds. Guardian on the ledge stays on the boss. Use the right elemental sniper and he goes down in no time.