i think i have an idea about how the traveler saved humans and brought the darkness so at the start there were two travelers in our solar system and the traveler that hovers over earth lets call it traveler a and the other traveler b. in our solar system the cabal lived on mars the fallen on earth and the moon. traveler a didn't like how traveler b was looking after the enemy races so he left to a near by galaxy. and hundreds of years later came back with a army of humans. they came and the enemy races and attract b.they then all fled the solar system to avoid being wiped out but traveler b built a army under Venus (the vex) and some of the fallen stayed on the moon were they would rot and turn into the hive. traveler a then took his rage on all the last monuments of the enemy races including the humans and then left our solar system to see where b had got to. after a few thousand years the traveler returns to the solar system as he fears b is back on it's way to destroy him. he then lets the humans find him and then he makes them battle ready (the golden age) and the b returns with the enemy races and have a big battle (the collapse) and b is known as the darkness and the the vex come up from under Venus and destroy human land marks. this game has space magic and is si-fi so any big plot errors ether would have of taken more time to write or magic so thanks for reading.