Horizon (mission)

This mission is the actual field mission acquired as responding to a summoning from the Illusive Man, coming as the Stop the Collectors: Go to Horizon part of the main plot mission, in reaction to an advanced warning on a possible collector attack on the Horizon human colony and requesting Commander Shepard to immediately go there, with the first members of the team he has been able to recruit, and attempt to stop the attack, if possible, or, at least, collect more information on the attacks.