Lore:Overlays
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An overlay is a massive field of mana that covers a large area and helps power spells and other magically powered abilities. They may be created by a mage school or other powerful entity. Overlays often have a substantial warping affect on the magical and metaphysical ecosystem in which they operate and can alter the rules that casting operates under. The most common use of an overlay is for casters that have access to it to use its MP to help discount their spells.