Absolute Rage was a buff that can be inflicted randomly on the player when their Rage Meter is high. It increases their maximum life by 5%. If the player is equipped with either the Heart of Darkness or Draedon's Heart, Absolute Rage will boost their damage by 10%.
Equipping either the Heart of Darkness or the Draedon’s Heart will make the player five times as likely to receive Absolute Rage.
This buff used to be known as "Heart Attack".
Before the update 18.104.22.168, this buff used to be a debuff that was inflicted on the player when the Stress value was too high. This is still reflected in the old buff's icon, as its background is red, not blue.