The Crucible



The Crucible is an ancient and highly complex device constructed by the Protheans as a superweapon to stop the Reapers, but never successfully implemented before their extinction. Its designs were stored in a Prothean archive on Mars and were later rediscovered by a Systems Alliance archaeological team. During the Reaper invasion of 2186, the designs are recovered by Commander Shepard on Admiral Steven Hackett's orders after the fall of Earth. The Crucible became the galaxy's last hope, all they way up until it failed to activate.