Hunter Protocol is an Epic Fortnite Emote. Hunter Protocol was available via the Battle Pass during Season 15 and could be unlocked at Tier 79.
Built-in emote for Lexa.
How-to Get the Hunter Protocol Emote
Hunter Protocol is part of Season 15. If that season is still currently in the game, you can obtain this item by purchasing and/or leveling up your Battle Pass.
Hunter Protocol's Attachments
Attachments are items that come with a cosmetic when it is obtained.