Harmony is character who appears in . She was based upon an original character created by Becky Allaker. Derek Landy has also stated that she has a relationship with Kingdom of the Wicked Nefarian Serpine.
Harmony appears as a guide for
Skulduggery and Valkyrie when they plan to find Serpine in the Alternate Dimension.
YouTube: "And she's sleeping with Serpine."
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