One of the most mysterious characters ever to come from Dragon Age is the Architect. First introduced in Dragon Age Origins: Awakening, the Architect's backstory was later expanded upon in the prequel novel Dragon Age: The Calling, though the revelations seemed to leave more questions than answers.
While the Architect does his best to present his plan as noble, players would be wise to question every word he says. Even if his motives were pure, his methods are nothing short of terrifying. Whether the player killed the Architect in Dragon Age Origins or not, if he's anything like Corypheus, it's clear that Thedas hasn't seen the last of him.
Dragon Age's Silent Mastermind
The Architect was long suspected by players to be one of the Tevinter Magisters that broke into the Golden City, and this theory was confirmed in Dragon Age: The Calling. The Architect was once a priest of Urthemiel, and those that played through Awakening will recall he has no memory of this life. While it's unknown what kind of person he was before the curse, the Architect's capacity for understanding human morality seems diminished, replaced by cold logic. The Architect saw nothing wrong with his first plan, detailed in The Calling, which consisted of tainting all of Thedas with the Blight so that his search for (and supposed defeat of) the Old Gods would go faster. The infection and war would have undoubtedly killed millions, which puts his motivations into question when he says he wants peace between Darkspawn and Humans.
While part of his inability to see value the lives of others might come from Tevinter's history with slavery, others may simply see him as irrevocably evil. The difficult part is trying to decipher what kind of villain he is -- one who thinks his cause is just and worth the price, or a megalomaniac who hasn't given up trying to become a god. The Architect's failed attempt to turn the Old God he once worshiped into his own disciple might just answer that question. His actions brought about the Fifth Blight, the events of Dragon Age Origins, and subsequently snowballed into everything that came after.
The Architect's Role in Dragon Age: Dreadwolf
As of Dragon Age Origins, there are two more Old Gods sealed away, waiting to be found. While Solas will no doubt be the main antagonist in Dragon Age: Dreadwolf, now would be the perfect opportunity to bring back the Architect. The game will even take place in his home country of Tevinter. If Solas does succeed in his plan and the Veil is torn down, it's unknown what will happen to the Old Gods. The sudden release of raw magic could cause the last two Blights to happen simultaneously. Wardens have featured heavily in DA4's promotions, and the Architect is explicitly tied to the Wardens, the Blight, the Old Gods, and Tevinter, so he has clear cause to step up somehow.
When asked about it in Dragon Age Inquisition, Solas seemed strangely resistant to the idea of the Wardens hunting down and killing the remaining Old Gods. He seemed to imply that the Blights might not end even if the Archdemons were all killed, which casts yet more doubt on the Architect's hunt for the Old Gods being a good thing. There is a very real possibility that Solas needs the Old Gods alive for some reason, which could put him and the Architect on a collision course. While this is all speculation until Dragon Age: Dreadwolf's release, hopefully Solas learned his lesson about working with Tevinter Magisters.
Dragon Age: Dreadwolf is in development.