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The Age of Alchemy refers to a period time proceeding The Schism, and prior to the curent events of the Oddworld Quintology in which the Glukkons attempted to disprove the Mudokon's claims to self divinity and being the Chosen Race. During this period the Glukkons formed thier own isolated society: choosing to spend their times indoors in refusal of the sky and the accursed Mudokon Moon.
Due to having spent such long periods of time hidden in darkness, the Glukkons underwent a stage of evolution which caused their eyes to glow in dark environments, as well as developing a sensitivity to sunlight.