This might look like a tight kill, but I actually could have survived 25 seconds more. He's actually not as hard as I thought.
Still, this is the "right" strategy if, for example, you're not a hunter.

The fight is simple : if you are at or above 25 stacks of debuff when he casts his AoE, you die. You gain a stack of debuff every time omega vector fades. And he casts his AoE every 25 seconds.
Note that if you feign death, you don't die from the One-shot. This is weird, and it made me think about using a 15-second FD + FD on each AoE strat.
But I figured this one was more fun and snappy.

So, there is no way to avoid the omega vector, or the one-shot (except FD). But thanks to the rogue @qlfwow5755, I realized you can immune the application of the debuff.
So you have to immune at the end of the omega vector.

So now the objective is to immune twice before reaching 25 stacks. If you do so, you will survive until the third phase 1.
Timings were complicated - if the vector ends during a stun, I would stack even with immunity. Hence why I use it at the start, even if the vectors are desynchronized.

The last thing I did was optimize dps. First, use the adaptation pvp trinket for stuns. Then you have a potion of unhindered passing that blocks one stun.
If you use it on the first stun, you'll have adaptation for the first stun in the second P1.
Else, wait until the second P1 to use it.
You want to burst as soon as possible to get your third burst in before the final AoE.

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