There is a Legacy version
here.
Spirit's Wrath [one-action] Feat 12Attack Barbarian Concentrate Rage Source Player Core 2 pg. 83Prerequisites spirit instinct
You call forth an ephemeral spirit, typically the apparition of an ancestor or a nature spirit, which takes the form of a wisp. The wisp makes a melee wisp rush unarmed attack against an enemy within 120 feet of you. The wisp's attack modifier is equal to your proficiency bonus for martial weapons plus your Strength modifier plus a +2 item bonus, and it applies the same circumstance and status bonuses and penalties that you have. On a hit, the wisp deals spirit damage equal to 4d8 plus your Constitution modifier. Don't apply your
Rage damage or your weapon specialization damage, but circumstance and status bonuses and penalties that would also affect the wisp's damage apply. On a critical hit, the wisp deals double damage and the target becomes
frightened 1. This attack uses and counts toward your multiple attack penalty as if you were the one attacking.
Traits
Attack: An ability with this trait involves an attack. For each attack you make beyond the first on your turn, you take a multiple attack penalty.
Concentrate: An action with this trait requires a degree of mental concentration and discipline.
Rage: You must be raging to use abilities with the rage trait, and they end automatically when you stop raging.