"Who made the vex?" That was a hard one huh? Obviously we can't answer these questions directly it's all lore and possible interpretation. So vex were made billions of years before us, before evolution even thought of us. We know this Bc of the ancient vex tech on Venus. Why didn't they just kill us before we even became a threat to them before we got the light? Well maybe we are going to be part of the process to create them and they are just moving us throw all the outcomes we need to go throw to get to there creation. That's why they won't and didn't end us...yet