The Other Side was a supernatural dimension where the spirits of dead supernatural beings resided in a state of purgatory or limbo. It was created by Qetsiyah with the intention of forcing Silas to spend an eternity with her on the Other Side instead of moving on and finding true eternal peace with his soulmate, Amara.

The Other Side was destroyed due to the doppelgänger blood that was ingested by the dozens of Travelers who sacrificed themselves and passed through the Anchor, gateway to the other side. The combination of doppelgänger blood tore through the Anchor and caused the Other Side to eventually implode within itself, taking whoever got stuck in the dissolving dimension, with it once it was truly destroyed.