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If radiants are mentally ill glow in the dark people (not my term).
Their mental illness should have some impact on their power.
Someone with anxiety will always have their blade at the ready. I can just imagine shardbearers drunk on mix of coffee and Redbull.
Or a person recieve a romantic confession and boom! Sword out. Especially if someone is trained to summon on reflex.
Would someone with high empathy have an easy time soulcasting?