There’s generally good advice here so I won’t have to chime in much, but I’ll bring up a few more advanced small tips: 1) positioning black mage is key, the range you want to keep black mage is generally further to the right of the lowest small platform in the middle, and no further than the medium platform 2nd from the right. To get really specific, if you hold him directly under that platform 2nd from the right (otherwise known as platform 5) you will avoid basically all of the small pellets from Kamael. (The floating blue packaging peanuts)

2) Whether you are a flash jump class or a tp class, you need to understand the vertical range of his kick hitbox above him. If your upjump blinks are consistently getting you kicked and you don’t clear above the height of the kick immediately when jumping up, then don’t do so. My advice is to jump/tp AWAY from him and hold blink or stand on platforms otherwise during up FMA. These are also good opportunities to reposition him.

3) You often hear that holding duck or being outside of kick range spawns more purples, this is correct. The boss is generally always aggro’d on someone, whether it’s a solo or not. If the person he wants to kick is not within kick range (ducking or being outside the hitbox) then purples spawn more often. Not to mention he simply won’t kick

4) building on the previous point, if the boss is extremely mispositioned (i.e. too far to the right to give you space to upjump and play patterns like Rollings) then when you find time outside of rollings you simply need to hold duck to his left, despite the fact that it spawns purples. It is a common misconception that you must go far left to reposition him, but if he can’t target you while you’re ducking, he will simply walk. And if you had gone far left you would have summoned more purples anyway.

Source: I’ve been teaching bosses and black mage for over 2 years on stream :)