Amulet of Unicorn Protection

As a reaction the wearer of this amulet can use Unicorn legendary protection on itself or any creature it can see within 60 ft. 

An invisible barrier of magical force appears and protects you or a creature you can see within 60 ft. Until the end of the protected creatures next turn, they have a bonus to AC equal to the users proficiency bonus, including against the triggering attack.

This energy appears as a shimmering unicorn horn on the protected creature.

This may be done the number of times per day equal to the users proficiency bonus.  This is reset each morning at dawn.

(Based on the Unicorn Legendary action)

Notes: Attunement by a Druid or follower of Larue, Buff, Utility, Jewelry