Sangheili Doctors: Adds regeneration to units out of combat, at a cost of reduced damage.
The faction as a whole is granted a perk similar to the UNSC's "Battle-Hardened", units gaining veterancy at a faster rate. The Swords of Sanghelios as a faction place strong emphasis on unit upgrades, troops becoming stronger only when they've seen action and spawned legends like the stories of ancient Sanghelios.
Swords of Sanghelios (Cutscene): With his government established, Arbiter Thel 'Vadam vows to bring stability to Sanghelios.
The Blooding Years: Thel 'Vadam fights to reach a duel and cut years from the civil war to come.
Arbiter (Cutscene): With ancient secrets, the 'Vadams forge a sword fit for Arbiters of old: the Prophets' Bane.
End of the Night: The Arbiter's most faithful accompany him to take back the legacy of ancient legends.
Heretic (Cutscene): With Rtas and the Shadow of Intent safely away, the Arbiter bears the outrage alone.
Blood of Our Sons: Rtas does what must be done, honorable or not.
Keepers of Bloodlines: The Arbiter must pursuade the mistress of a Keep to aid him.
Breakers of the Faith: Rtas 'Vadum delivers Yermo from the zealotry of the Servants of the Abiding Truth.
Summit at 'Mdama (Cutscene): Thel 'Vadam announces his intention for peace with the humans, and meets little support.
Terms of Destruction: The Arbiter reminds Sanghelios it has no place for scavengers.
State of Vadam: The Arbiter returns home from his odyssey to find his household despoiled.
Shadow of Intent: Stolt leads the Rangers to repel boarders within and without the hull.
The Return (Cutscene): The Shadow of Intent arrives to find Sanghelios in chaos.
Opposing him are the Covenant-faithful Servants of the Abiding Truth, and Sangheili bandits formed in the chaos of the Schism. It follows the return of Arbiter Thel 'Vadam to his homeworld at the end of the Human-Covenant War, and chronicles his efforts to reunite his people and establish the Swords of Sanghelios. Swords of Sanghelios’ campaign stands apart from the main game's story, taking place on Sanghelios in early 2553.