The Witness goes by many names; The Winnower, The Voice in the Darkness, etc. However the one we're going with in-game thanks to Savathun is The Witness. Then there's the opposing entity: We call it The Traveler. Eliksni and Cabal call it a Machine. In opposition to The Winnower, it's also called The Gardener. It has a voice as well (Lore tab for Ghost Shell in Vow of the Disciple) Season of Drifter when we were told about "The Game" that Light and Dark are playing in. The Winnower / Witness believes in power over all, the true Final Shape is Survival of the Fittest, all those who are weaker will perish. "No more Death.... No more Life...." In the end, it basically seeks eradication of all sentient life or perhaps it will gift the last remaining species with immortality as a reward for winning "The game". The Gardener / Traveller seeks Peace through Cooperation. A belief that at some point, everyone can set aside their differences and work in harmony. This is the game they play, a competition of beliefs. However, historically, The Traveller has always lost. The story we play is not the first time this game was played, we're on an unknown amount of restarts and Elsie Bray is the only person alive right now who has an idea on how many times this game was played out. Dark Future lore books from Beyond Light state how one of those games ended: Dark Guardians vs what remained of Light Guardians and our character was not on the Light. Eris was the main "Queen" of Dark Guardians as well. Ikora and Drifter were dead, Mara Sov and Zavala were making one final desperate attack against the Dark Guardians while holding the Traveller captive with the Leviathan after it tried to flee again. During the battle, Mara Sov died from a betrayal by Ana Bray, who was killed by Elsie shortly after. Zavala was overrun and in one final moment, the Traveller sent Elsie back in time to the celebration parade when Cayde-6 was marked the new Hunter Vanguard after killing Taniks. We do not know how often that happened though, and Elsie has been trying to find the right methods to stop it from happening again. Back to The Witness, that's probably their entire point. To witness this game of theirs play out. It's won before, and it probably believes it will win again regardless of how many resets the Traveller makes.