The vonduun crab was an organism used to shape the vonduun crab armor suits of the Yuuzhan Vong. It was discovered by the New Republic that the bafforr trees of the planet Ithor could be used against the vonduun crab armor, as the crab was allergic to the pollen produced by the tree. This reaction would cause the vonduun crab to swell, killing the crab and anyone wearing it. Vonduun crab armor was protected by the same energy field that an amphistaff carried, generated by a power gland. For this reason, it could withstand the atomic-diameter edge of an amphistaff, and even a lightsaber.