Unison Rush (ユニオンラッシュ, Yunion Rasshu?, lit. "Union Rush") is a technique that appears in the international release of Kingdom Hearts Birth by Sleep and in Kingdom Hearts 3D: Dream Drop Distance. It allows the user to rush enemies together with teammates.
In Kingdom Hearts Birth by Sleep, Unison Rush is an Advanced Friendship Command that takes up three slots in the Command Deck, has a maximum level of 1, and a normal reload time of 50 seconds. The user rushes around the field, attacking enemies with the Keyblade. During Mirage Arena battles, every available player will join in for the attack. Damage is increased by pressing the buttons that are prompted on-screen.
Learning Unison Rush
Kingdom Hearts Birth by Sleep
Kingdom Hearts 3D: Dream Drop Distance