TRILOBITE ARMOR

The trilobite armor is a wonder of symbiont engineering.  Space trilobites are natural symbionts with many of the colossal beasts which wander the depths of space, them with the same benefits as trilobite armor.  Adapting the space trilobite to accommodate a medium humanoid host was one of the pinnacles of symbiont engineering.

Trilobite armor is available in two varieties of symbiont; a light armor symbiont or a heavy armor symbiont.  Unlike many symbionts, trilobite armor does not occupy a biological system but instead occupies a character’s armor slot and grants an armor bonus to EAC and KAC.  Wearing trilobite armor causes 1 point of permanent Strength drain while the symbiont is attached.  However, you gain a +2 enhancement bonus to your Constitution score, gain light fortification (25% chance to avoid a critical hit), and the symbiont can automatically stabilize its host once per day without expending a Edge. 

 The evolution retrovirus can be used to increase the trilobite armors EAC and KAC.  In addition, trilobite armor gains an upgrade slot with each evolution.  See Table 5-2 Trilobite Armor for additional details.