Yorik-Kul

Surge-coral was an organic device used by the Yuuzhan Vong. Surge-coral was implanted into slaves, which would then allow the slave to recieve mental commands from a yammosk or a dhuryam. Jacen Solo was implanted with surge-coral after he was captured by the Yuuzhan Vong, and it allowed him to sense the Yuuzhan Vong through the Force.