Destiny is a futuristic first-person shooter set in a persistent world. When humans first set foot on Mars they discovered the Traveler, a giant sphere that then allowed mankind to colonize space quickly. Centuries later the Darkness, an enemy of the Traveler, arrived and waged war against it and all of its creations. The Traveler is forced to scarify itself as a measure of protection and what is left of humanity on Earth is forced to live in a city constructed underneath. The Traveler enlists warriors known as Guardians with special abilities as a personal army. These Guardians are guided by Ghosts, artificial intelligence. The player's character is found by such a Ghost (acting as a robot companion in the game) and becomes a Guardian.