The Vex have a longstanding feud with the Hive, both trying to achieve true immortality. Oryx thought the Vex his only true peer, and was slowly gaining power to destroy them. But Oryx didn't count on one thing. Humanity crafting the Warminds. The Vex can simulate any scenario all simultaneously, but it can't simulate a Warmind. The reason being that Warminds are smarter than the Vex and are therefore unpredictable. It was these Warminds that disabled the Traveler from leaving, therefore creating a Bastion for Humanity to fight the Darkness. Humanity gained the Guardians, something never before seen in the universe or in the wars Oryx waged against all previous races. It was the unexpected that Oryx could not adapt to and was therefore destroyed. It was Guardians that stopped the fall of the Vex, something the Vex never expected. Humanity was an unexpected variable in a universe of constants. Rasputin is probably the most important entity still existing. And the Sleeper Simulant sucks. "The weapon could have been a cornerstone of the lore, a weapon brought forth by perhaps the most powerful entity in the known universe to defend it and all it stood for, and it sucks balls larger than the Traveler." - TheOneTrueBanana