Moonshield
As the moons orbit through and between the skies, the cast of their light can influence different types of magic, sometimes inundating the land with primal energy the energizes plant and animal growth, or empowering wind and flame beyond their normal capacity, and so on. But when a moon shines too brightly, or (gods forbid) Brome comes out from Ethereum, emergency measures must be taken to avoid their pale beams of light. People must hide from the light, taking shelter under roofs if possible, or trying to get underground if not. With too much moonlight, people and animals can undergo spontaneous mutation from the corrupted energy.
With this fear ever present, something was created to deflect, reflect, and scatter the light. Simply dubbed a "moonshield" this device was created by the most prestigious glassmaking experts. A large dome of clear glass, made to the size of shield needed, redirects light into several panes of colored glass. Depending on the combinations of moon that are present that night, apertures and gimbals can be used to direct the moonlight through specific panes, to neutralize some of the color. As the light passes through the panes, it is reflected by carefully placed mirrors, which can be positioned to reflect light away from the moonshield. As a final measure of defense, a well-made moonshield will have several large prisms and gems, which can be fitted to refract light into a less devastating form. When sized and applied correctly, a moonshield can prevent the deadly moonlight from destroying a city.
Access & Availability
Unfortunately, the delicate construction of moonshields makes them quite rare. Few survived The Fall, and many were destroyed or lost by the churn of the grasses. The few cities that have them must treat them dearly, for the ability to make large, exact constructions of glass has been lost with the fall of civilization. With access to the right materials, an accomplished artificer can make personal, backpack-mounted versions more easily than the behemoth types made to protect a city.
Complexity
To make a proper moonshield, one would need access to fine glassmaking tools, such as grinders, ultra-fine grit sanders to make lenses, large enough gems and prisms to catch light, as well as precise metalworking tools for the frames, gimbals, arms, and so on. Even at the height of the magical age, these were rare, complex contraptions, too delicate to be mass-produced.
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