You’ve more than likely done them while playing. I know I’ve done a few.
From another site: The game features two styles of special attacks for each character, Critical Arts and Special Arts. Each fighter has four Critical Arts, which give you the chance to do increased damage on on critical hits. Combatants also have one Special Arts, which gives them a period of invincibility at the start of the move. You’ll recognize Critical Arts and Special Arts by the particle and motion blur effects.