History of Arach

Arach is the title of the leader of Dead Orbit, used as a prefix: Arach Jalaal is the faction's current representative to the Consensus. Destinypedia quotes the faction's sacred text: "The role of Arach is not a gift, not an honor, but a curse and a pledge of service." Past holders it lists include Arach Henri, Linde, Modesta and Parnell.

The Destiny 2 Wiki does not explain the title, only the character.