SFS Standard Caterwaul Concertina [one-action] Feat 17

Source Galactic Ancestries pg. 37
Frequency once per day
Prerequisites Pahtra Caterwaul
By preparing your caterwaul, you can focus on your performance and sing to a wider audience. If your next action is to use Pahtra Caterwaul, you can affect up to five targets instead of one. If any allies in range of your caterwaul speak Pahtra, they can spend their reaction to join in on your Pahtra Caterwaul. If at least one ally joins the Pahtra Caterwaul, increase the frightened value of targets that fail their save by 1.

Traits

Concentrate:An action with this trait requires a degree of mental concentration and discipline.
Pahtra:A creature with this trait is a member of the pahtra ancestry. Pahtra are cat-like people who value competition, music, and freedom. An ability with this trait can be used or selected only by pahtras.