User blog comment:The Milkman/Shades of Purple/@comment-5287758-20120930050555/@comment-4237253-20121005041021

I don't view this as arbitrary. We're talking about the dues ex machina device that resolves the entire conflict that has been running for three games now. This machine is higly implausible, and defies several conventions of logic as well as some natural laws. Keep in mind that this isn't fantasy, and as such, the natural laws of our universe must be obeyed. Of course, these laws can be bended a bit, as you said with Eezo, but there was an explanation for that, and it was the cornerstone of the trilogy. We are introduced to the Crucible at the start of the game, but its machinations are not ever made clear, and when we discover its effects, we are not even given a rational explanation. Keep in mind, this is not something we see a whole lot of in realistic sci-fi.