Unlike Prism, it does not achieve harmony with light and dark, but rather overcharges the element being used. If we proceed in this way, we can use three types of Light Energy to fill the "Transcendence energy." For example, if we want the Void Subclass to use "Transcendence", we must use Arc, Solar, and Void types of damage to fill the energy, and none of the three are missing. If one type of damage is missing, "Transcendence" cannot be used.
Or it can be achieve harmony with the opposite element. For example, using Strand type damage to fill the "Transcendence Energy" of the Void Subclass.
Anyway, it's just an idea.
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Nah, Transcendence’s whole idea is mixing light and dark. That should not be brought to the other static subclasses. Let them be their own thing. However, the idea of a gauge is fine. Maybe light is filled by the other two light types, and darkness from strand and stasis? Eg. Void takes solar + arc Solar takes void + arc Arc takes void + solar Stasis takes strand + (next darkness subclass) Strand takes stasis + (next darkness subclass) (Next darkness subclass) takes stasis + strand So here, you’re retaining the idea of light and darkness being separate things, letting prismatic have the idea of mixing light and dark, but using light for light, and dark for dark. A light and darkness “Mastery” gauge, if you will. And that will work just like transcendence.