Encounter Series 3 - Stampede by Moonlight is a 30 page pdf that contains a lengthy and detailed encounter for the 3e OGL system. This product is one of several in the Encounter Series from Corvus Lunaris, and each is designed for several hours of play for when the GM needs something to fill the space, or simply just wants to run with some of the ideas contained within the pdf. This particular encounter features a rather sinister force stalking the night and the canyons, and it's up to the PCs to foil its plan and deal with a rather elusive prey. Stampede By Moonlight is designed for characters of levels 5 to 7.
This product comes as a single pdf file, complete with all the frills in a cover, extensive bookmarks, credits page, table of contents, and generally a well laid out pdf. The design and presentation isn't fantastic, but it gets the job done and a fair amount of effort has gone into getting it the way it is. There's no colour in the pdf, nor are there any borders or other page frills, so the pdf should be really easy to print. In essence, the presentation is more like a printer-friendly version than a screen version, but even that is still fair. Writing is good, and the product is well organised. The pdf also includes an extensive battlemap complete with 1"-scale tiles for use with miniatures. Overall, fairly presented, well organised, and good use of support features and frills to make the product worth that little bit more.
As mentioned, this encounter is fairly detailed. It starts by providing extensive lists on what various Knowledge checks will provide the players with - this is very useful, as it gives the PCs some needed information throughout the encounter. Having said that, most players will already know most of the information in this section even though their PCs might not. There are some useful bits of background there, though, and revealing this to the PCs piece-meal will make the encounter more interesting and build some suspense.
Next up is the encounter, which can be a fairly straightforward affair, though it has the potential for being drawn out and protracted if the DM chooses to make use of some of the suggested options. It's one of those encounters that not many DM or players will like, as it deals with lycanthropy and afflictions of that nature, and some people might not be predisposed to running with some of the ideas in the product. Nevertheless, it is fairly unique and open enough that DMs can modify and structure it to their pleasure. This is not a simple combat encounter - while parts of it are, I think the longer ranging encounter is going to be built on subterfuge rather than all out combat. Still, the good thing is that enough information is provided to make of this encounter what you will. You can use it as an interesting terrain while fighting during a stampede, or otherwise as a minor encounter with more subtle effects afterwards.
Several useful plots hooks are provided to expand on the material in the pdf, though there is a lot of material and background in the product already. Full statistics are provided for all creatures involved, and these look fairly good from a correctness point of view. The latter part of the product is devoted to providing a fairly rudimentary map of the encounter, both as an overview and as a battlemap with one-inch scale tiles. This gives you a little extra for the product, and while not the most beautiful tiles I've ever seen, they perform the function they were intended for.
Overall I think this product does a few things well - it provides a somewhat unique encounter and locations, gives detailed background information on the encounter, and offers plenty of options for expanding or modifying the encounter. At the same time, the presentation is fair, though not by any means great, and the added utility of the battlemaps is a plus. On the other hand, the subject material in the OGL system is a nightmare for most DMs, as dealing with afflicted lycanthropes is not necessarily for every players or DM. Players invest in their characters, and don't want to loose them to lycanthropy, while at the same time DMs don't want to railroad their campaigns looking for cures. I think this encounter has potential, and the format is good, but it lacks that special factor to make it entirely memorable. If you're looking for something a little different, don't mind doing a little work to make it fit, don't mind the subject and love detail, then this product is for you.