As Franca prepared the ritual, she considered her options and said to Lumian, "The Overseer's mirror coordinates are indescribable and can only be procured through mystical means. The Magic Mirror Spirit Channeling Spell isn't capable of that. I intend to use standard spirit channeling instead."
While the Magic Mirror Spirit Channeling Spell she had developed greatly extended the duration of the channeling and the number of questions the spirit would respond to, it was constrained by relying on the mirror as a medium, forfeiting the chance for other types of interaction.