The Fallen

 

Ideals
The Fallen are formed around the idea that the Sangheili owe humanity nothing. They are currently attempting to divide the UNSC and Separatists, which is known as the Rift Crisis, by the kidnapping of Sangheili Separatist children.

Tactics
For being vehement supporters of Sangheili culture and lifestyles, the Fallen use tactics that Sangheili have never used before. There is no open warfare, no posing before the other. Ironically, they seem to have taken a page out of human insurrectionists, using espionage and sabotage to great effect.