Bonus action usage, especially from casting hunter's mark, has always been a pain point for many rangers, so this hat simply addresses it by allowing a quick cast and free up your BA for something else.
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Speed and stealth are often crucial for a ranger's work. The tip and shape of this cap ensures a ranger's mystical focus never wavers, always ready for battle at a moment's notice.
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Hunter's Cap
Wondrous item, uncommon (requires attunement by a Ranger)
While attuned to this cap, you know the hunter’s mark spell. On your first turn of each combat, when you hit a creature with a weapon attack, you can immediately cast hunter’s mark on the creature using your own available spell slots, no action required.