If you wish to mirror Victorian romantic ideas about magic, or the pseudo-scientific approach of Crowley, here's a good start.
Publisher's blurb: "From Victorian literature and actual occult practice to later fiction set in the era, depictions of magic (or magick, to use the spelling proffered by Aleister Crowley) are varied. Imperial Age Magick does not attempt to present a single magic system. Rather, it is meant as a tool kit for GMs to design the magick system that best suits their campaigns by mixing and matching numerous elements, creating a system that is specifically and inherently Victorian in tone.
"Imperial Age Magick presents several magical styles for the Game Master to choose from when creating an Imperial Age: Magick campaign, whether that involves faerie court intrigues in London, the private wars of occult secret societies, or even Oxford Dons fighting eldritch horrors - all within the context of the familiar and accessible d20 Magic System. By combining the options offered in this supplement (all based on real-world Victorian occult practices), a GM has a total of nine magick systems from which to choose, each scalable to suit the power level of the campaign.
"Including details on actual Victorian occult societies, New feats and skills, and the Hermetic Disciple advanced class, Imperial Age Magick is everything you need to add period-appropriate magick to your Victorian-era d20 campaign."
More when I get hold of a copy!
Book Details:
Authors: Scott Carter & Walt Ciechanowski
Publishers' Reference: ADM4103
ISBN: n/a
PDF, 36 pages
Date: December 2006
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Product page last updated: 2 December 2006