From The Introduction:

Pyramid of the Dragon is a Labyrinth Lord™ adventure for 4-6 characters of 5th-7th level. This adventure is a quick romp in and around a swamp known as the Blood Marsh that involves both wilderness and dungeon exploration. Challenges include a mixture of problem solving, combat, and roleplaying, including several potentially lethal encounters with a red dragon and various other denizens of the Blood Marsh, so characters who rely solely on the might of their sword arms may be in for a rude surprise.