Lethean Campaign

The Lethean Campaign was the last House Military campaign of the Second Wave. It began in the eleventh year of the War in Heaven on the time-front world of Lethe.

The Campaign was one of the few protracted physical conflicts in the War. It involved mercenaries and auxiliaries fighting for both sides, including the Knight Immortal of the Remonstration Bureau, who was subsequently believed to be destroyed during the battle. The Campaign also saw the last military usage of casts, 73 of which were deployed in battle and destroyed by the enemy's ship-eater weapons. This created a firestorm that burned on Lethe for years.

With promises of pardons and new regeneration cycles, the ruling Houses lured renegades to the Homeworld. The renegades were then overpowered, lobotomised by military psychosurgeons, and fitted with neural links to the three remaining babels. The babels were then released on Lethe, where they committed ruthless massacres against enemy forces for over a year, until an unknown party boarded the timeship where the lobotomised renegade operators were hidden, outwitting both guards and security systems before painlessly killing the operators. This left the babels momentarily defenseless, and they were immediately destroyed by waves of enemy suicide attacks.

The Book of the War discounted the story of walking dead commandeering a timeship during the Lethean Campaign as "pure invention, at least for the time being." (PROSE: The Book of the War)