Reinforced Phobium Armguards

Reinforced Phobium Armguards is a premium wrist-slot heavy armor. It can be obtained by Jedi Knights as a mission reward for completion of the level 28 mission The Death Mark, on the planet Alderaan.

Source
Reinforced Phobium Armguards is a mission reward obtained by completing The Death Mark, a level 28 mission obtained on the planet Alderaan.
 * Mission reward