The Executors are first mentioned in Dragon Age: Inquisition through War Table missions; in this title, they play such a small role that anyone could easily flip through and miss them. That may have been the intent. Since their introduction, the Executors have been a mysterious faction in the world of Thedas, likely hailing from Across the Sea. Dragon Age: The Veilguard not only doubles down on this mystery, but it heavily implies that they may be the next threat to Thedas. It also smells like a Red Herring, but whether that's true or not remains to be seen.