There's a talking dragon waiting to share their wisdom and power with the party. He is, like, a couple hours away from the city everyone spends like a few sessions in, preparing to be sieged. NPCs are all talking about how great were the legendary times when dragons were helping dwarves with defending the city. There are dragon claw marks on the city walls. A geographer sponsored by one of my party members tells stories like:
"There was once a cavern just here, near the city, where lived an ancient dragon. And you know what? People don't talk about this place anymore, it isn't on any recent map and nobody goes here. Ever. What could be hidden there? Who knows? If only someone could, like, walk in here and take a look".
Nope, never happened. My party destroyed the whole damn dark forces army all by themselves and left the city. They are now heading to the cooking contest organised by a pixies queen.