This is fantastic. For an old adventure, it still suits the sensibilities of modern d&d players quite well. Also, who doesn't want to fight a vampire lizard king?!
The maps are high quality, the text is easy to read, and if you're running a different edition, conversion is about as simple as it gets. Most of the 1e monsters have pretty intuitive 5e replacements. If you're comfortable adjusting damage and hit points behind the screen to keep things balanced, you can just replace the monsters with whatever makes sense.
The setpieces are evocative - a troubled lord in his hall, a burned village, a murky swamp, an ancient tomb! The monsters are fun and classic: cultists and dragons and vampires! There's opportunity for social classes (bards and rogues and paladins will shine in the opening scene and the village) as well as more boot-and-loot styles (most of the module IS a dangerous dungeon). Really something for everyone and a lot of fun.
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