The Second Battle of Grat was an event that occurred during the Collapse, due in-part to Grat's status as the Jūreichi (重霊地, Important Spirit Ground). The destruction that formed the Reikai caused a backlash of pure spiritual power that was let loose in Grat. The destruction aside, which was later referred to collectively as The Collapse, the event coincided with a full-scale attack on Grat by a number of Kikkashō agents and Kikkashō-controlled Hollow. The latter stages of the Investigating Grat arc, which is the first chronological event of Bleach: Cataclysm and told from the perspective of Garrett Sheppard and Tiffany Henderson, leads directly into the Second Battle of Grat.