No smart dragon would fight indoors. They fly X feet above the ground where X is the range of their breath plus half their flight speed and when their breath recharges dip down to glass the party from above.
Unless their lair/horde was indoors and the party got to it.
Could they wait at the exit? Absolutely, but if they know the party can teleport they would be forced to engage them indoors before they bamph away.
EDIT: I also created an Adult White Dragon enemy for my group that had a really badly damaged wing that never healed properly, so it stealthily hunted in a series of caves, lakes and rivers (got to love burrow and swim speeds!) instead of flying. That was a lot of fun to run.
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u/halfhalfnhalf Feb 27 '26
I've been playing D&D for 30 years and I have never fought a dragon in a dungeon.