The Vong are a race of religious zealot masochists. They genetically engineer and grow all of their organic technology and view mechanical technology as blasphemy. They endeavor to improve their physical capabilities through organ grafts from other species. The Vong function in a caste system, and those higher up in position have more body modification and mutilations.
Proving the extent of their might, the Yuuzhan Vong were able to conquer Coruscant.