Doom Striders is a rules supplement for integrating mecha ("Doom Striders") into the d20 system. Presented as a natural evolution of the fantasy arms race, the first chapter provides background and requirements for adding them to a campaign, followed by chapters on their construction, combat, their mystically bonded crew, details of several doom strider units.

From the back cover:

Weapons of War and Valor

Catapults and ballistae are the weapons of yesterday's armies, impersonal tools of warfare that were imprecise and whose loyalties depended on the crews manning them. Doom Striders presents a new type of weapon designed for more heroic play styles and face-to-face encounters. Whether you're looking for a weapon to throw at your opponents in the next mass combat encounter, or an effective offense against a dragon guarding its horde [sic], you'll find something within the pages of Doom Striders.

Prepare to Meet Thy Doom

At their heart, doom striders are magical constructs whose purposes are limited only by the imagination of their creators. Wizards and sorcerers craft them as weapons of war or as a safeguard to privacy; clerics can build them as monuments of faith and might; warriors might seek to lead one into the thickest of combats. The choice is yours...

Requires the use of the Dungeons & Dragons Player's Handbook by Wizards of the Coast, Inc. This product utilizes material from v3.5 [sic] revision. 8-1/2" x 11" perfect bound softcover, full color cover, 128 black & white pages, MSRP USD$22.95.

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