Main article: Nightsoul Burst
When your party contains a character from Natlan, when a character deals Elemental DMG to an opponent, a Nightsoul Burst will be triggered. The more characters from Natlan you have in your party, the shorter the CD before another Nightsoul Burst may be triggered: When you have 1/2/3 or more characters from Natlan in your party, the CD between Nightsoul Bursts will be 18/12/9s respectively.
Nightsoul Burst can trigger other effects, such as Character Talent and Artifact effects.