Battle of Malachor
this was the decisive battle of the Mandalorian Wars, in which a group of Jedi Knights were forced to use every means possible to defeat the Mandalorians. Under the command of Revan, the Jedi fought bravely, but were unable to stop the forces of the Mandalore. In the end, one of Revan's Generals - a former Jedi Padawan who was known simply as The Exile - triggered the Mass Shadow Generator that wiped out all life on Malachor V, killing Mandalorian and Jedi alike in an effort to end the conflict. The resulting destruction tore a hole in the fabric of the Force, which The Exile consisted the source of his inability to contact the Force.