"Presented only to those red mages who have displayed excellence on the Ballista battlefield. Red Ballista chevron must be returned to a Herald after set period indicated in official Ballista rulebook."
You will get this key item when you are first at Ballista Ranking at the category: Red Mage.
With this chevron you are the owner of the title Scarlet★Star for one earth week.

For further information on chevron and Ballista Ranking see Ballista.