It is so weird why dont just do this already.
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% If you notice, the Vex only attack non Guardian populated areas. The Sol Divisive (Black Garden Vex), are an exception, as they're probably just trying to defend their turf or get closer to the Pyramid. They avoid direct Guardian confrontation altogether as Light cant be simulated. So of course they wont risk sending the calvary on the unknown. One titan mauled millions of the things. Imagine what a whole city of them could do on their home turf. %