The Helghan are a human group in Killzone.
 Echo helps him escape to find out that  Jorhan Stahl has a "weapon" designed that would annihilate Vektans and half-breeds, which he considers traitors
 By the end of Killzone: Shadow Fall, it is revealed that the main antagonist is Stahl, who managed to survive the events of Killzone 3, but is dispatched by Vektan Security Agency director Thomas Sinclair

