Dragon Attack

The adult blue dragon Lennithon accompanied this raid but is not an enthusiastic participant. His chief contribution has been his Frightful Presence, but that becomes less effective as the night wears on and defenders overcome their fear. Shortly before midnight, the dragon launches a final assault against the citadel. Frulam Mondath orders the attack, knowing that the adventurers are in the keep at the time. Lennithon doesn’t consider this to be his fight, and he isn’t keen on tangling with adventurers for another’s benefit.
During this attack, Lennithon flies over the keep and uses his breath weapon without moving closer than 25 feet from the parapet. The defenders on the walls have mastered their fear of the dragon’s Frightful Presence from earlier attacks. There are twenty NPC defenders on the walls at the beginning of the mission, and more can arrive between attacks to take the place of those who fall. The dragon doesn’t target the adventures at first, and every breath attack not directed at them kills 1d4 NPC defenders and injures 1d6 more. Adventurers who happen to get caught in the area make normal saving throws and take standard damage. The NPCs’ attacks are ineffective against Lennithon. Bear in mind that the dragon’s breath weapon will kill a 1st-level character outright, so be sure to demonstrate its destructive power to the players before turning the dragon against the party.
After each attack, Lennithon swoops away until his breath weapon recharges, then swings in for another attack. He repeats this pattern until he has taken 24 damage or more, or a single critical hit. After that happens, Lennithon leaves for good.
Rewards Characters earn 100 XP each for driving away Lennithon, but reduce that award to 50 XP if 10 or more defenders were killed during the attack. For their role in driving off the dragon, the characters receive two potions of healing and two potions of greater healing from the grateful Governor Nighthill.