Clionadh Tower is a cool duochrome with a metallic finish that is permanent and retails for $14.25. In comparison, Terra Moons Witches Broom Nebula is a cool duochrome with a metallic finish that is permanent and retails for $15.00.
Terra Moons Witches Broom Nebula is 80% similar — it is more shimmery, darker, warmer.