"You are not alone."

As a Star Guardian fades, their power is reborn in new protectors. Star Guardians are chosen for their strength and resolve, but above all, they are chosen for their courage. It often signals a cataclysmic battle elsewhere in the universe when multiple Star Guardians are chosen to serve at once.

Additional Source - Star Guardian page on League of Legends official North American website: http://na.leagueoflegends.com/en/featured/skins/star-guardian-2016