Radius is a fighting style in which the user focuses their willpower and strength into their punches and kicks, dealing damage in an AOE around the user. In order to get it, you have to go to the Ice Maze Wilderness Island and talk to Freedrock, the Wise Warrior. Its moves are nearly identical to melee, but each attack sends out an AOE damage, which hurts those in the AOE. This makes Radius Fist good for defeating large crowds of mobs or multiple players coming after you.