"Dash forward and inflict damage. Hold RT/R2 to pursue. If the dash attack hits, temporarily changes all Slash attacks to fire."
Infinity Cyclone (無限刃旋空 - Mugenjin Senkū, lit. Infinity Blade Whirling Air) is one of the Abilities exclusive to Shishio in Jump Force.
Overview
Shishio runs forward while grinding his sword across the floor, with intent to slash the opponent upwards. If it connects, the following 15 seconds, all his sword attacks have the added Fire element.
Charging the move does a follow-up attack that makes him do a diving attack while engulfed in flames.
Infinity Cyclone in action