Found in the Grand Archives, on Gertrude's lifeless body lying inside a large bird cage at the top of the archives. To reach it, enter the tower guarded by the three Gertrude's Knights and drop through the open hatch inside. Make way through the rafters and drop through the open door on top of the cage.
When cast, multiple pillars of light will erupt at random points around the caster over a period of several seconds, each dealing 1.9 times the Spell Buff of the catalyst as physical damage and knocking most opponents into the air. Each pillar is regarded as its own separate damage instance, meaning that getting hit by a pillar early in the cast will not prevent an enemy from being hit by another one in the same cast instance.
FP cost is based on the number of pillars summoned. Upon initial cast, 13 FP is consumed, and additional FP for each pillar afterward. A maximum of 15 pillars (including the one from the initial cast) can be called down for a total cost of 55 FP. Interrupting the caster will also halt the FP consumption of the Miracle.