2012 · كتاب مصدر (قواعد/خيارات لتعزيز اللعب)

On the Inverse Calculus of Unseen Refraction

This gothic magical accessory explores invisibility as both an arcane science and a source of psychological unease, examining the effects of existing unseen and questioning the boundary between illusion and reality. It provides background and rules for alchemical and optical experimentation, including six alchemical discoveries, a metamagic feat, and eight spells and alchemical formulae such as the Transparency Mutagen and vitrific visibility. Designed for campaigns involving alchemy, magic, mad science, or Gothic adventure themes.