Rainbow
The Rainbow is an uncommon tool-type martial soul, notable for existing in a natural fusion of light and water, a built-in blend of elements that marks it as a powerful spirit.
Most martial souls command a single nature. The Rainbow is the exception. It is a tool spirit whose form fuses light and water, existing from awakening in a state of element fusion that other spirit masters labor toward, and that built-in harmony of two natures is the source of its regard.
A tool spirit shapes the abilities its spirit rings grant, so a soul that is itself a standing fusion of elements promises combinations a single-nature spirit cannot reach.
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