I wasn't sure what to expect when I downloaded this product, and I can't say that was I pleasantly surprised. Essentially, the product gives a six-page verbal description of an arcane library—there's no map—with another page devoted to resolving research in the library and two pages of NPC writeups. The product description says that the product is for d20/OGL, older editions of D&D, and any system; of course, no product can be all of this at once, unless it contains multiple sets of stats or no stats at all. This product doesn't take either of those courses, but gives statistics that don't belong to any of the listed systems. There are many references to magic items which are nonstandard for original D&D, AD&D, or d20 D&D, and since the items are never described, they certainly aren't systemless. Whatever system this was written for uses seven attributes: Agility, Beauty, Intelligence, Speed, Stamina, Strength, Will, and Wisdom. I don't recognize this spread. If you understand what "resist 1d20 GTET 35-Stamina" means, you know the system; I don't. The "rule system" entry on the description page clearly misrepresents the product. If this product were truly systemless, with descriptions of the NPCs' personalities instead of stat strings, and descriptions of the effects of their items instead of just names, it might be useful (a map would make it more so). As it stands, I might get a little mileage out of the descriptions of the tower, but the rest of the product does nothing for me.