It can be executed by pressing / multiple times after performing a Homing Attack. After landing a Homing Attack on a target, Shadow can consecutively attack with rapid strikes up to five times, dealing additional damage and being able to defeat most enemies.
In addition to inflicting more damage, the Chaos Attack has a few advantages as well. While Shadow is performing the move, he temporarily becomes immune to other enemy attacks and avoids damage. This may be because his attacks are blocking whatever attacks are thrown at him. Also, when defeating an enemy with just a Homing Attack, Shadow can defeat another enemy with Chaos Attack if he is close enough to them.