Fortified Trox
Source Galactic Ancestries pg. 194
You bathed in the waters of Gabanon Springs during a molting period. Extra nutrition from the spring's waters soaked into the soft tissues, doing wonders for its composition. Your exoskeleton might look more stonelike than most of your kind, or it might have taken on a gemlike sheen as the membranes grow denser than is normally possible.
Your chitinous plates are medium armor in the plate armor group that grant a +4 item bonus to AC, with a Dex cap of +1, a check penalty of –2, and a Strength threshold of +3, and have the analog, comfort, and exposed traits. You're trained in your chitinous plates. You can wear a flight suit over your exoskeleton, but you can't wear other armor. You can etch armor runes onto your chitinous plates, but you can't install armor upgrades.
Your chitinous plates are medium armor in the plate armor group that grant a +4 item bonus to AC, with a Dex cap of +1, a check penalty of –2, and a Strength threshold of +3, and have the analog, comfort, and exposed traits. You're trained in your chitinous plates. You can wear a flight suit over your exoskeleton, but you can't wear other armor. You can etch armor runes onto your chitinous plates, but you can't install armor upgrades.