Karmic Justice acts as a sort of auto-defense miracle; it unleashes a powerful shockwave in all directions once it is triggered, dealing damage and knockback to hostiles. The damage dealt by the miracle is dependent on the magic adjust of the item in the player's right hand, as well as if they are wearing items like the Crown of Dusk and Red Tearstone Ring.
Triggering is caused by either one or two heavy blows dealt to the caster, or by a series of light attacks. Karmic Justice disappears from the player after it is triggered once; players who desire its benefits must cast it again. Karmic Justice can be activated even when the hits are being blocked by a shield (if the applicable defense value is below 100%).
Karmic Justice is a unique miracle. In PvE, it can be useful to cast this just prior to fighting a large group of enemies as insurance should the player become surrounded. However, Karmic Justice won't help the player if they are killed when or before it triggers, making it less useful at higher levels of difficulty due to the high damage opponents do in NG+ and beyond. In PvP, Karmic Justice can be useful for more defensive players as a way to prevent opponents from being overly aggressive.
The hit counter required for activation of Karmic Justice remains active even during a player's dying animations, potentially setting off Karmic Justice post-defeat if opponents continue to swing at the player.
Karmic Justice remains active for one minute before wearing off.