From the Introduction:
"Welcome to Fire and Brimstone: A Comprehensive Guide to Lava, Magma and Superheated Rock, released under the Open Gaming License. These rules work with nearly any game system, and provide you and your players with exciting and easy-to-remember lava rules that will be sure to provide you with many memorable hours of gaming fun.
These rules will enable you to incorporate realistic but playable
lava features in all your games."
Includes examples of play using the optional rules with both Dungeons & Dragons and World of Darkness systems. Also a preview the Fire and Brimstone CCG.
This product was nominated for an ENnie award in 2008 in the category "Best Free Product"
Available for download from http://www.lavarules.com/
From the back cover of the book:
"This is a breakthrough in determining a long burning question of great magmatude. I plan to institute this comprehensive rules coverage in the Lejendary Adventure game!" — Gary Gygax
"The most realistic and elegant magma mechanic ever conceived for True20... or any RPG!" - Steven Kenson, True20 designer and line developer.