Here we have a cave a black dragon might call it's lair. The cave is optimized to give the black dragon a home-field advantage against any would-be adventurers who come to take it's treasure. As kobolds are known for serving dragons, I have included a few classic kobold traps that will allow the kobolds to be a big help to the dragon. If the adventurers come through the small passage on the left, too small from the dragon itself, the kobolds have a pressure-plate waiting to block off their entrance, and fire an arrow at the one who triggered the trap for good measure. When the kobolds notice that the passage is closed off, they'll know someone is trying to break in, and run to alert the black dragon. If the adventurers catch the kobolds by surprise, perhaps by entering through the main cave entrance and crossing the bridge, they'll run through the north passage. One kobold will try to alert the dragon, while the rest will wait by their secret lever, and ready some actions. When an adventurer enters the correct hex, one kobold will drop a falling net on them by pulling the lever. If you have two more kobolds, at the ready, they could make some attacks against the trapped adventurer, or run up to them and splash a vial of oil on them, and lighting a fire. All this can take place before the adventurers even see the dragon.
When the dragon does make it's appearance, it will go all out. To protect it's treasure horde, it'll utilize every advantage. The black dragon will be able to fly in circles around it's lair, using it's breath weapon as it flies by the party, and using the rest of it's movement to get away. If it needs to, it can escape through the open ceiling room, and return through the cave entrance as well. Black dragons are also excellent swimmers, so diving into the water in it's lair may serve as a means of protecting the dragon from ranged and fire-based attacks.
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