I got this back when it cost money. It was a good purchase then, but it is great now that it is free. This supplement comes it at four pages, including the cover and OGL, leaving us with two pages of content. Aside from the cover, there is no visual artwork; just tightly-packed crunch.
Anti-magic fields can be difficult to handle well in the d20 system. Once an AMF turns on, magic jumps from being super powerful at everything to being completely nonfunctional. There is no middle ground. This supplement corrects the all-or-nothing nature of AMFs. There are three separate mechanics, each of which can adjust the power of magic in an area: Difficulty (to use a spell), Consequences, and Radius. Difficulty refers to a check required to overcome the effects of an AMF (the ‘traditional’ AMF in the game’s core rules has an infinite DC). Radius is self-explanatory. Consequences has four mechanics for altering the effects of magic: Chaotic magic, Delayed magic, Eliminated magic, and Hindered magic.
Afterwards, there is a sample golem which emits a Hindering anti-magic field.
Short Term Use: Incremental Antimagic can be added in to an encounter or monster statblock without much work, and can produce interesting encounters or traps. And, it’s free. 5/5
Long Term Use: The system presented is robust enough to handle a wide range of situations, while simple enough to use easily. It’s really short, but you can keep mixing these effects into encounters for as long as you are running the d20 system. For a free product, this is an easy 5/5.
[5 of 5 Stars!]