SFS Standard Spiked Exoskeleton Feat 1

Source Galactic Ancestries pg. 20
You have spikes extending from your external shell. These spikes deal 1d4 piercing damage to a creature that grapples you or hits you with an unarmed attack.

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.