Heavy Guard appears as a defensive ability. It has an ATB cost of 15 and drains 5 ATB per second while increasing Lightning's physical and magic resistances by 50%. It is an upgraded form of Guard. Its effects can be buffed if it is used while wearing the Sacred Knight garb.
Heavy Guard Lv. 2 is a locked ability for Quiet Guardian and Heavy Guard Lv. 3 is a locked ability for Paladin.