Familiar The master of a trilobite familiar gains a +1 natural armor bonus to AC.
Curl (Ex) As a standard action, a trilobite can curl into a ball, increasing its natural armor bonus by 2 but preventing it from taking any move actions. Uncurling is a standard action.
Ancient arthropods adapted to scavenging the ocean floor, trilobites have both resilient exteriors and keen senses honed for use in the lightless depths of the sea, and are known for curling into balls to protect themselves.