When the boss reaches certain hp thresholds, a message will warn “The Iron Conqueror activates a Security Device” and he will summon two colored Iron Armor adds. Before the adds spawn there will be a circle on the floor indicating where they will spawn and what color will appear. These adds will be on the circles in the corners of the arena, diagonally from each other. Shortly after summoning the adds, he will throw AOE projectiles at the two farthest people, those people should be in the corners the adds are not. Example below.
Taking those breaks will help your joints and your muscles, but also help relieve some of the eye strain you get staring at your computer all day. Minimizing glare with correct monitor placement will also help, but there are a few tweaks and pieces of software that might help you out. The first thing to do is make sure you have ClearType turned on in Windows, and increase your monitor's refresh rate . I'm also a huge believer in programs like Flux , which will keep your monitor much more eye-friendly at nighttime (if you tend to work later into the evening).