This is the best horror adventure I've seen in AL, with a better handle on atmospheric horror than all of the season 4 Ravenloft DDAL adventures. It's a four-hour adventure, but it's easy to finish within three and a half hours, or even sooner depending on where the adventurers go and how much time you want to spend in exploration and descriptions. It's part of a trilogy, but it can easily be run standalone.
The story of Army of the Unseen is built upon a specific monster from Mordenkainen's Tome of Foes, and the adventure uses that monster's lore and mechanics to its fullest. The adventurers arrive at the town of Dynnegal and explore the area, slowly realizing that something's gone horribly wrong in town and that there are unseen horrors all around them. Eventually, the party must defeat the horrors that they can't even see and try to find a way to stop the curse before it spreads. The adventure features two major NPCs with a lot of personality and depth, as well as a ton of well-crafted letters and handouts which reveal the story of the town in a deliberate and natural manner and which really reward attention to detail from the players. I would strongly recommend having a player read most of these handouts aloud when they receive them, since they really add to the atmosphere.
In terms of mechanics, the module includes several battles which don't feature a ton of monster variety, but are still tactically interesting due to the unseen monsters and the method of revealing them. Battles with those monsters around town are best handled with theater of the mind to keep things simple and add to the creepy atmosphere, but the set piece encounter in the library is best run with a map since the adventurers can move things around and position their assets ahead of time, so a battlemap can really reward them for planning ahead. The first and last battles can be run either way, though climactic fights are always best handled with a map. The adventure features two battlemaps for the library and the final battle, as well as two gorgeous maps for the town and the nearby farmstead.
Besides combat, the adventure also has a simple puzzle that the adventurers need to collect and assemble to proceed. The puzzle is very easy for players who are familiar with D&D spellcasting, and even if they can't figure it out, it's not hard to just try all the combinations, so it's not going to be a bottleneck on the adventure. Mostly, the puzzle pieces help flesh out a major NPC's personality, and provide a good reason for the party to explore around town.
The editing is of high quality overall. The adventure is laid out and structured in a natural manner which provides the DM with all the information they need by the point that they need it. I didn't notice any obvious spelling and grammatical errors, and the adventure has solid internal consistency. My only complaints are that the background info has a stilted, passive style which makes it a bit harder to understand than if the sentences had clearer subjects and more active voice, and the box texts are overall quite helpful, but can be a bit too long and flowery at times. There's also one point of confusion regarding consistency: the bell tower atop the library is supposed to ring at dusk, but there are no monsters or anything else of interest on the upper floors of the library, so my table wasn't sure who was pulling the bell. I handwaved it by saying it was a magical bell, but it would be nice if the adventure provided an explanation. The NPC and Location summary is also laughably brief, so I would have liked to see the entries fleshed out there, or to have the page removed entirely (since the exact same info is in the adventure primer).
Overall, Army of the Unseen is an excellently-crafted atmospheric horror adventure which is a great showcase for how the lore of a monster can inspire an entire adventure around it. This is truly one of the best AL adventures I've ever seen, and I can't recommend it highly enough.
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