Seeing an ally rage fills you with your own fury.
Prerequisites
Benefit
Whenever you are adjacent to an ally who is raging, you may choose to enter a similar but less powerful rage as a free action on your turn. This weaker rage gives you all the benefits and penalties of a barbarian’s rage, except your bonus to Strength and Constitution is only +2. There is no limit to how long you can rage, as long as you remain adjacent to a raging ally (for example, you could take a 5-foot step away from one raging ally toward another raging ally and maintain your rage). As with a barbarian’s rage, when this weaker rage ends, you are fatigued. You cannot use this feat if you are fatigued.