The Hive were originally fairly peaceful. A multiple planetary alignment caused wicked bad tsunamis on their home planet and they had to flee. Ten bucks says they are from the Alpha Lupi system or came through it. The Hive, led by Oryx (or his original peaceful female self), formed a symbiotic relationship with the Worms in an attempt to survive. The Worms turn the Hive evil. Oryx turns evil (and male) too. The newly evil Hive tear off trying to dominate the universe. The Worms seed their embryos on the Hive ships and planets the Hive conquer. Not much is heard from the Worms after this. Interestingly, there are worm-like creatures in the Dreadnought. There are multiple planes of reality. Oryx has a complex and tempestuous relationship with his sisters. He kills them but they don't seem to mind as much as you'd think. Maybe because he can bring them back to life? Oryx kills a Worm god so he can access the Deep and access other planes of reality. The Deep seems to be the fundamental laws of the universe or the plane of existence fundamental to the universe. Weed might help understanding this part. In a youthful experiment, Crota brings the Vex into our plane of reality. This puts him up shit creek with his dad, Oryx. Oryx is especially pissed off because the Hive can't beat the Vex. The Vex seek to dominate the universe also. The Hive and the Vex are therefore two aspects of "The Darkness". The Darkness is the desire for total domination of the universe, either that or the Worms are the Darkness. The Hive and the Vex could not beat each other despite fighting a war. Therefore the Hive and Vex indirectly compete with each other to dominate the universe and cleanse it of weakness. The Hive (initially) and Vex (probably) hunt the Traveler and make war on worlds that it has visited and helped have Golden Ages. I'll lay odds that the Fallen and the Cabal are victims of these wars. They have been displaced by war with the Hive and Vex respectively and have fled to our solar system. The Traveler shows up in our solar system and starts off the usual Golden Age. Then it gets disabled after it is attacked. It seems like the Traveler had never been disabled before because it had always eluded the Hive. I figure it might have been attacked by the Hive and Vex at the same time, causing it to be disabled. Pretty simple, really. Although not much is said about the origin or motivation of the Traveler. Now all we Guardians need to do is kick some ass to get it all back to normal. Lock 'n' load my brothers and sisters!