So, I am running a mini-campaign for my kids and my wife. The kids wanted a combat heavy game so I grabbed the 4e adventure Revenge of the Giants and started converting it as I wanted to play something like Against the Giants. One of the optional quests is to retrieve skymetal to create some special artifact weapons. In the adventure, all the skymetal is gone so the characters go back in time and steal it from a wizard.
Since in my AP the adventurers (literally) nuked Silver Mount and it no longer exists, this gave me the idea to have that wizard be Furkas Xoud while he was still with the Technic League. Not only did this give the players a kick as they played through the Iron Gods AP and so knew who he was it let me revisit the setting and create some updated gearsmen and other tech gear.
They eventually faced the living Xoud but instead of fighting him they talked him into providing the skymetal they needed but also to trade future knowledge for some technological weapons. Not only did he find out that there is an evil intelligence in Silver Mount but that his future self-found out about it from an android called Casandalee (they did not reveal that the hunt killed him). Nicely setting him up for the AP.
Was a fun little side trek for me and the players. I always like doing campaign callback when I can to see that the players actions actually do change things in the continuity of my world.