A core was a formation of troops, perhaps specifically of snipers, used in the Sith military of the Brotherhood of Darkness at the end of the New Sith Wars. Snipers are also known to have been assigned in small numbers to individual units such as the Gloom Walkers, but they were distinguished from the ordinary Sith troopers by their abilities and weaponry (TC-17 sniper rifles), and as such they may have comprised a specialist cadre within in otherwise largely undifferentiated ranks of the infantry.