User blog comment:Legionwrex/Did the Leviathan DLC really add a new twist to the endings?/@comment-24.60.42.14-20120831022415

I don't think they are immediate threat. We honestly don't know how many of them are still left in the galaxy, but I doubt it's very high. The Leviathans are somewhat handicapped by the Alliance which knows how to disable the artifacts and to track down Leviathan locations via the artifacts. If all else fails, the Alliance could just destroy the artifacts, cutting the Leviathans off from the rest of the galaxy.