Description: Some creatures have the ability to enter a state similar to a barbarian rage. This ability grants a temporary bonus to strength and constitution, with a bonus of +3 for rage, +6 for improved rage, and +9 for greater rage. The duration of a rage is the creature's constitution modifier (before the rage) plus 1, in rounds, with a minimum of 1 round. The duration of an improved or greater rage is the the sum of the creature's constitution modifiers from before and after the rage, in rounds. This bonus cannot be dispelled.