Traits

A straight, longer than average horn. 

An extra long tube horn. Good for fanciful displays and showing off, but depending on the size it can really strain the neck. There's no definitive size limit, but don't make horns that go into orbit, please.

Royals, Nobles, and Guardians with extra long horns can magically retract them right down to being a nub, if they desire. Civilians and Nomads unfortunately lack this feature and must be very careful where they lay their head- but it's super rare for them to have extra long horns anyway.