"Shoot a series of projectiles to inflict damage. Hold R2/RT to fire additional projectiles."
Sand Shower (砂時雨 - Suna Shigure, lit. Sand Drizzle) is one of the abilities available to use in Jump Force.
Overview
The user creates a small wall of sand in front of them, which fires small projectiles made of sand at their opponent. Holding the energy load button will increase the amount of projectiles launched.
Origins
Sand Shower is an ability involving Gaara's special sand where he forms small, dense pieces which he launches at the opponent. Normally it's rained down from above, but this version is fired from a protrusion of sand Gaara creates.
Sand Shower in action