"Presented only to those corsairs who have displayed excellence on the Ballista battlefield. Coral 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: Corsair.
With this chevron you are the owner of the title Surging★Star for one earth week.

For further information on chevron and Ballista Ranking see Ballista.