Similar to the Sharingan the dōjutsu portion of Reisei is not available at birth. Instead its activation is triggered by an emotional or stressful situation. Appearing as a bright blue colored eye surrounded by five symmetrical crescent shapes. Even after this initial activation the user may not fully master its activation and deactivation for some time, as seen with Nōsei. Until control over this dōjutsu is fully master it may activate and deactivate at random, which seems to be accompanied by the onset of intense migraines which will plague the user until the dōjutsu is mastered. While intense training appears to increase the speed at which this kekkei genkai is mastered, time seems to be the primary factor.