SFS Standard Dermal Spikes Feat 1

Source Player Core pg. 48
Spiky protrusions jut from your body, which you can use to wound your attackers. Your Fortitude DC against Athletics checks to Grapple or Shove you increases by 1. Additionally, you gain the Piercing Spikes reaction.

Traits

Barathu:A creature with this trait is a member of the barathu ancestry. Barathu are a floating, jellyfish-like ancestry who rewrite their own genetic code at will. An ability with this trait can be used or selected only by barathus.