Type: Anarchic
Source: Dragon #326
The power of chaos improves your rage ability. While raging, your muscles shudder with uncontrolled energy as the spirit of chaos pushes you past your natural physical extremes.
Prerequisite: Intimidate 4 ranks, ability to enter a rage.
Benefit: Your effective barbarian level increases by +4 for the purposes of your rage ability. This feat can't increase your effective barbarian level beyond your Hit Dice. However, if you gain benefit from the full bonus immediately, but you later gain non-barbarian Hit Dice, you may apply the rest of the bonus.
For example, a human 8th-level barbarian/3rd-level fighter who selects this feat would increase his effective barbarian level from 8th to 11th (since he has 11 HD), allowing him access to greater rage. If he later gained another non-bard level, he would gain the remainder of the bonus and his effective barbarian level would become 12th (since he now has 12 HD), granting him the ability to rage four times per day.
This does not affect your trap sense, uncanny dodge, or any other barbarian class feature. It only increases your effective barbarian level in regards to using your rage ability.
Special: Aura of Chaos: A character with at least one anarchic feat radiates an aura of chaos with a power equal to his character level (see the detect chaos spell), as if he were a cleric of a chaotic deity.