Critical Rate buff applies on self or allies, so they can have a higher chance to perform a critical hit on enemies with any of their skill. If a Critical Hit is performed, then it will do Critical Damage on top of the inflicted damage. Critical Rate and Critical Damage works in a pair. These stats play an important role for all Attack role champion and Champion that relies mainly on Enemy HP stat to inflict high amount of damage. There are 2 versions of Critical Rate buff (15% and 30%). The first Critical Rate buff adds 15% Critical Rate chance while the second Critical Rate buff adds 30% Critical Rate chance on top of the existing total Champion’s Critical Rate stat.