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I had grand plans of the dragon throwing the gauntlet down in a dramatic manner: It made some fly-by breath attacks on isolated ravens outside the lucky bones, then perched on the roof of the temple in full view of the city. My plan was to give the group a good chance to buff to the nines and have a dramatic fight with larger stakes than just killing the dragon. So when the group approached the temple fully buffed the dragon took to the skies and flew full speed towards the opera house (the focal location of the song of silver), it had planned to spend a few rounds lighting the building on fire before the ravens arrived, I would get to use those maps again, and the players would have a chance to show off some of their more mobility orientated abilities (teleport, fly).
Unfortunately the clues I left about where exactly that dragon was flying were not successful, the group believed the dragons was fleeing. In their eyes the dragon was fleeing and they just spent an hour planning buffs. They were not allowing this to go to waste. They kicked open the temple doors and charged in, Starting a 3 session long epic encounter involving all of the temple and the dragon.
The dragon specifically arrived late to the fight because it took many rounds to realize the ravens would not be pursuing it and return to defend the temple. Because the group was still fighting the high priest and the vampire when the dragon arrived it served as a good flanking pressure on the group terrifying the casters. I also didn't want to TPK quickly so the dragon made some subpar tactical choices: throwing out breath weapons every time it was available and destroying summoned monsters that were doing a number on mooks. I'm quite sure the dragon would have caused a TPK as it came in to wipe up a wounded, depleted group, but the skald/hellknight multiclass got a very lucky curse on to the dragon, then it rolled to not act for 3 of the next 4 rounds...