Darth Revan the Punisher
Very little is known about this being. Recently disturbing visions have been plaguing the Jedi. All these images point towards a great calamity befalling the galaxy. Amid this calamity a being will rise to end the suffering however, in doing so, the galaxy is enslaved and billions of creatures are wiped from the galaxy forever. Only an image and a name are constant throughout the visions. They both appear to have some small connection to the Jedi master, turned Sith Lord, turned Grey Jedi, named Revan. However, any further connection after the name is impossible to deduce.