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I knew her from her portrayals of Casca in Berserk and Lux from League, which is why I thought it was her. Thanks Gumball. Did you find a source some where or you just think it's her as well?
I wish there was a source but I can undoubtedly confirm that Carrie voiced Lethor. Hearing her speak in Persona 5 and the animation confirmed it for me.