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Five cosmetic emotes have yet to be implemented in Battlegrounds mode: Bookworm Elise, Confused Bigglesworth, Pinocchio Blingtron, Sparkhoarder Togwaggle, and Vanndar Cavedweller. These emotes have been visible (some for years) but have never been made available in any way.
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Similarly, a series of Murloc-style hero skins (all illustrated by artist Mooncolony) have been showcased for about three years but have never been made available for purchase.