If you've also noticed, the Darknees is pretty much the opposite of the Traveler. The Darkness uses the worms as a proxy to deal with its hosts. The Traveler was fully visible and worked directly with the races it brought up to Golden Ages. The Darkness gives death to the living. If the Hive are to ever stop eradicating life, they will be consumed by the worms inside them. The Traveler gave life to the dead.