Yun'o were the name of the religious individuals that were worshiped by the Yuuzhan Vong and were actually the regional Force wielders of the Yuuzhan Vong galaxy and unlike the known Universe were described as deep in the Dark side to such an extent that the Jedi couldn't hardly sense their Avatars at all, even after their demise they continued to exist through reincarnating as Avatars and through shielding the Yuuzhan Vong from the Force sensitives in this new galaxy.