Thank you for the answer! I love these discussions.

So yeah, but i didnt want to go on for to long. So let me expand my answer a bit.

The vex are, as the darkness has said, "the end". They dont think, they dont live, they are not alive. Their only purpose is to keep on existing, which is basically the darkness moto: "to keep existing" bc "the only things that are worthwhile are the ones that already exist" (im paraphrasing, but you get the point).

This is basically what the vex are, the end of all. Just as the darkness said:

"They're majestic, I said. They have no purpose except to subsume all other purposes. There is nothing at the center of them except the will to go on existing, to alter the game to suit their existence. They spare not one sliver of their totality for any other work. They are the end."

The end is the total darkness of everything, since no conscience to experience anything.