Sachiel's Flash

Water × Spatial Magic: Sachiel's Flash (水×空間魔法『の閃き』) is a water and space-based Union Magic spell.

Description
With an open grimoire and purified devil power, the user opens a small spatial portal from which shoots a continuous beam of high-pressure water. The beam is capable of cutting through buildings, and the user is capable of altering the direction of the portal to change the beam's angle and follow the target's movement, as well as create multiple portals at once for additional beams.

Trivia

 * Sachiel is the name of an archangel in Kabbalistic and Christian mythology.