Source: Unapproachable East
You have studied the fighting style of the wolf and employ its tactics in combat.
Prerequisite: Ability to rage, membership in the Wolf berserker lodge (see Berserker Lodges).
Benefit: You gain a +4 bonus on trip attacks and on checks to resist an opponent's trip attacks.
Special: Characters with this feat may choose the Improved Trip feat even if they don't meet the other prerequisites for Improved Trip.