Zombie Badger said:
I was not referring to the Catalyst when I talked of a Deus Ex Machina, I was talking about the Crucible. If we look at Mass Effect as one story, the Crucible is a plot device introduced in the third act with no build-up or foreshadowing and which only exists for the purpose of wrapping up the plot without an explanation as to how it does so. This is a pretty good definition of the term.
Incorrect, and a straw man argument.
Sure, let's examine Mass Effect as one single piece of work. It doesn't follow the stereotypical, oversimplified "three-act" structure. In fact,
very few professional works do -- it just happens to be people who lack understanding of drama and structure that mistake entire acts for singular plot points, or misunderstand multiple acts as one. The trilogy is best-understood in the
five-act structure: introduction, conceit, turn, spiral, and climax. It's been the gold standard in storytelling since Shakespeare.
Act 1, the introduction, establishes the world, existing conflicts, and dramatis personae. That's a straightforward proposition: that's ME1, from Eden Prime all the way to Virmire. The player learns about the universe, the species in it, the state of galactic affairs, and the shadowy impending Reaper threat.
Act 2, the conceit, is the complication and conflict by which the dramatic question is introduced. This is the source of momentum for the plot of a single story. In the stereotypical three-act structure, this is mistaken as the first plot point as it's usually a pretty short act. In this case, it's pretty clearly marked by the Sovereign dialogue introducing the Reapers properly and establishing their identity and the true nature of the threat, and introducing the dramatic question of "can Shepard stop the Reapers?". It's also important to note that in ME1, while Sovereign is destroyed the dramatic question remains, which indicates the end of ME1 is the closure of the second act.
Act 3, the turn, is the act which further complicates the conflict, focuses the dramatic question and generally foreshadows the means by which it will be answered. This is the "second act" of the three-act structure. In this case, it's the entirety of ME2 (more on that in a bit), and ME3 from the beginning to Priority: Palaven. The Reapers arrive, the Crucible plans are discovered, and Shepard finds a starting point in unifying the organic species against the Reapers.
Act 4, the spiral, is the act in which the dramatis personae are set in place for the climax, and the motive force for the climax is established. This is the "rising action" of the three-act structure, and again typically a very short act as it serves as segue between turn and climax. Again, this is easily identified in Mass Effect as a singular story: Priority: Sur'Kesh to Priority: Horizon. This is when the Crucible is built, the organic species' alliance is built, and Cerberus' role in the greater narrative is revealed, setting the stage for the climax.
Act 5, the climax, is pretty self-explanatory. In ME as one narrative, that's Cerberus HQ to Earth. The momentum established in the fourth act carries the plot to its final fruition. Mind you, in five-act structure denouement and conclusion are encompassed within the fifth act.
ME2 has no real place in this, because if you are to examine ME as a singular story, it's a subplot and only indirectly related to the dramatic question. The only real development there, that the Collectors were building a Reaper to act as Sovereign's surrogate, was introduced and resolved in a self-contained narrative and relegated completely to the third act. So, you're right -- the Crucible is introduced in the third act...
of a five-act structure.