[quote]What happened exactly with the Prometheans and like the knights and stuff. Like why did they go from knights to soldier?[/quote]Knights and Soldiers are separate entities. The Soldiers are an Armiger platform created for the Human-Forerunner War. [quote]Do we have any idea what installation that Halo was in the legendary ending to H5?[/quote]It's not Installation 03. [quote]I was confused about Cortana's plans to control the galaxy. What were they exactly? [/quote]Send the Guardians to various star systems and subjugate the various species of the Milky Way. Those who wouldn't comply would be destroyed/Composed. Essentially, she completed the Reclamation and now holds the Mantle of Responsibility with the other Smart AI's who joined her. [quote]Were Guardians ever mentioned before Halo 5?[/quote]No, but given what their purpose is, there was definitely a place in the lore for them.