This article is about an item used in God Emissaries. For the item used in the Slayer challenge given by Vannaka, see Perfect blue dragon scale.
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Perfect blue dragon scale (God Emissaries) detail

A perfect blue dragon scale is dropped by blue dragons and baby blue dragons during the fifth combat-related assignment given by a God Emissary leader. This item, along with five jogre talismans and a demon horn, are needed to complete the job.

If lost, then you must kill another blue dragon or baby blue dragon to replace it.