Coming Up With Ideas

[JenniferOrange]

In my opinion the easiest way to come up with ideas is to work backwards. Think of how you want it to end, then create events that will lead up to the finale. (Ex: Ends with a wall exploding and the Player finds a hidden, ancient room. Let's say, before that he created an explosive, and before that he found the secret laboratory, and before that he discovered an abandoned castle.)
I also like to just Wikipedia certain centuries, like the 14th, and read about events that happened. They both help.