What’s the most fun you ever had creating something in a game that changed the game-world?
There was a point early on in TiHE where one player decided that, mathematically, there had to be ten “factors” in the universe (including the three dimensions + time). I don’t recall the specifics, but he’d written something up for a future earth that utilized amazingly engineered sources of power that no one completely understood… all they knew was that they Math for the power source only worked with Ten factors involved.
It was convincing enough as an argument that I reexamined the sources of power (at that point, including the aforementioned 4 dimensions, I only had a total of eight). With that impetous, I realized there could and should be a ninth and tenth, which then changed significant portions of the later story.
Ander and his player had a huge influence on the game — sadly, that’s not really reflected in the game logs.
I guess I was happy with the Twilight power I came up with for TiHE.
I tend to come up with plots that change the setting, not items. I think my all-time favorite in that department was when I realized in about session eight of TiHE that Benedict-with-one-arm was a fake; Osric posing as his captured-and-currently-blinded brother. That was fun.