Guardian

The Guardians (a.k.a. "knights") are a group of Human protectors tasked with the protection of Humanity together with its various remnant societies. Equipped with an advanced arsenal of weaponry and vehicles, as well as the ability to channel the Traveler's power (referenced as "magic", or something similar in function to it), Guardians traverse the solar system in individual starships capable of interplanetary travel. These ships can vary in size and firepower and can be modified for specific purposes. Among other missions, their priority is to combat the malicious alien races that came to inhabit the solar system between the time that humanity was pushed back to Earth and when they began to take to the stars again.

There are three known classes of Guardian: Hunters, Warlocks, and Titans. Hunters utilize stealth, Warlocks can use the power of the Traveler, such as "spells", and Titans are equipped with "Mech Suits".

Trivia

 * Destiny