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Upon activating it, a text box with the word "Omnislash" appears at the top of the screen. Cloud then charges forward (in a similar fashion to Critical Hit, Marth and Lucina's Final Smashes), catching and launching any opponent he hits upwards with his sword before repeatedly slashing them in midair and slamming them to the ground, dealing massive damage. It is functionally similar to Great Aether.
In most Final Fantasy games, magic spells and special attacks are preceded by the appearance of a text box showing the move's name at the top of the screen, hence the "Omnislash" text box at the beginning of the Final Smash.