Rage (feat)

A Barbarian can fly into a Rage a certain number of times per day. In a rage, a Barbarian temporarily gains a +4 bonus to Strength, a +4 bonus to Constitution, and a +2 morale bonus on Will saves, but he takes a –2 penalty to Armor Class.

The increase in Constitution increases the barbarian’s hit points by 2 points per level, but these hit points go away at the end of the rage when his Constitution score drops back to normal.

While raging, a barbarian cannot use any Charisma-, Dexterity-, or Intelligence-based skills (except for Balance and Intimidate) or the Concentration skill, nor can he cast spells or activate magic items that require a command word, a spell trigger (such as a wand), or spell completion (such as a scroll) to function. He can use any feat he has except Combat Expertise and metamagic feats.

At the end of the rage, the barbarian loses the rage modifiers and restrictions and becomes fatigued (–2 penalty to Strength, –2 penalty to Dexterity, can’t charge or run) for 60 seconds.

At 1st level he can use his rage ability once per day. At 4th level and every four levels thereafter, he can use it one additional time per day.

The duration of Rage is 30 + (Constitution modifier x 6) seconds. It does not appear to increase with level. The Barbarians base attribute is used for this calculation, not the rage-enhanced Constitution.