Cave Legs
Become trained in Acrobatics (or another skill if Acrobatics is already trained) and gain the Quick Squeeze feat. Represents exoskeleton adapted to tight tunnel movement.
--- Scrambling through tunnels beneath the rocky surface of Nchak can be difficult when you're a 12-foot-tall arthropod with thick, armored plates covering most of your body, but they say practice makes perfect. You've spent enough time squeezing yourself through tunnels that your exoskeleton has grown accustomed to bending and deforming to fit in tight spaces, and by now, it hardly slows you down at all. You become trained in Acrobatics. If you would automatically become trained in Acrobatics (from your background or class, for example), you instead become trained in another skill of your choice. You gain the Quick Squeeze feat.