This old work was drawn for "ask OC Deities", idk how translate this correct, sorry!

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They say:
- Do you want to see my dark side? I'll see you in your nightmares, then.

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I think both Madara and her sister have multiple voices, in different tones. If you visualise the sound of their voices, it would be like main theme with a glitch effect. You hear the main voice, but at the edge you hear two or three other voices as an echo, creating a slight color noise.