Dark Red Knight is a Legendary skin that is part of the Dark Reflections Pack! These packs have existed in the past where they remix popular skins. They've done the Frozen Legends Pack, Lava Legends Pack, and the Shadows Rising Pack. These typically include a few skins and some other cosmetics and go for $19.99 USD.
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Dark Red Knight's Attachments
Attachments are items that come with a cosmetic when a particular one is purchased.