The Calm refers to an uncertain amount of time of peace in Spira between Sin's defeat at the hands of a summoner and its next public appearance in Final Fantasy X. According to the Final Fantasy X Ultimania Omega guide, the first Calm lasted 500 years, with subsequent periods being shorter. Braska's Calm lasted less than a year. In the long history of Sin terrorizing Spira, there have been four periods of time known as the Calm.