The Either is the thirty-fifth audio drama for The Horus Heresy series that was not originally released as part of an anthology or other release. The Either was first released as part of the Meduson limited-edition anthology and later as an audio drama in February 2016. The title has since been released as part of the Shattered Legions main series anthology.
Captain Tybalt Marr of the Sons of Horus, so often overlooked by his more glory-hungry brethren, returns to his Legion in triumph. However, his boasts of having slain the infamous Iron Hands warleader Shadrak Meduson soon fall flat when he learns of the recent assassination attempt on Horus himself. Gathering his forces upon the conquered world of Dwell, Marr returns to battle against the Shattered Legions, determined to earn his rightful place in history.
- The Either (Audio Drama) by Graham McNeill