Barrier

Barrier (リフレク) is an ability that appears in Kingdom Hearts Birth by Sleep and Kingdom Hearts III. It momentarily summons a spherical shield of light around the user, fending off enemy attacks.

Mechanics
In Kingdom Hearts Birth by Sleep, Barrier is a exclusive to Aqua that is triggered either on the ground or midair by pressing  while stationary or walking. Holding the button extends the duration of the barrier whenever any attacks come into contact in succession. If used in midair, it cancels the user's momentum. Barrier has a maximum level of 3.

In Kingdom Hearts III, Barrier is an. When used, the user surrounds themselves with a barrier that blocks attacks from all directions.

Kingdom Hearts Birth by Sleep

 * Aqua has Barrier as an initial command.
 * Aqua can purchase Barrier from the Command Shop for 200 munny once one world is cleared or the command has already been obtained elsewhere.

Kingdom Hearts III

 * Guardian Form has Barrier as a form ability.
 * Riku has Barrier as a default ability.
 * Aqua has Barrier as a default ability.
 * Kairi has Barrier as a default ability.

Kingdom Hearts Birth by Sleep
Barrier is used to meld the following commands:
 * Barrier Surge
 * Time Splicer
 * Mine Square
 * Renewal Barrier
 * Confuse Barrier
 * Stop Barrier

Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-
Aqua has Barrier as a default ability.