The planet with their giant super important simulation was being eaten by it (and might still be eating it, we only decoupled it from the sun)
I'm kind of surprised they haven't telaported onto it and tried shutting it down or converting it into something to nullify the sun like in the future that they attempted to make, and you gotta admit it'd make an interesting strike :p
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[quote] so why haven't the vex launched an all out attack on the almighty?[/quote] There has not been a comic book detailing it yet, so it is not canon. The "lore team" (aka comic book writers) likely has yet to figure out how to turn that scenario into a perverted love interest story.