The order's ranks are filled with the men of noble houses across the Empire. Their selection process is considered extreme even among the other Orders, as each Knight in training must spend a year in study within the church where he is judged by the priests as to his worthiness.
During The End Times, they were attacked by Undead forces led by Mannfred von Carstein and Arkhan the Black searching for Morhikhane, the Black Armour of Nagash at their stronghold of Heldenhame. The Knights of Sigmar's Blood were almost totally obliterated in the battle and their second in command, Rudolph Weskar was killed by Mannfred von Carstein himself. The remaining knights died after becoming frustrated with their High Elf allies, led by Eltharion the Grim. They charged into a trap devised by Mannfred and Elise von Carstein, where Leitdorf duelled the former to the death.
The Grandmaster of the order is Hans Leitdorf, brother of the late Marius Leitdorf. His second-in-command is Rudolph Weskar, a tyrannical and stubborn warrior. One quirk about the order is that they contain no Inner Circle knights. However, the unit known as the Brotherhood of Steel was considered the best in the order and generally looked up to.
The Knights of Sigmar's Blood's heraldry is mainly red, while their armour is silver. Most of their shields are mostly red, with the skull of Sigmar wearing a laurel wreath. They sometimes contain a yellow hammer. The Brotherhood of Steel has white shields with emblazoned with the letter S and laurels. All of the Knights of Sigmar's Blood carry white lances with black fire on them.
- Uniforms and Heraldry of the Empire -- p. 63
- Warhammer Armies: Empire (7th Edition) -- p. 40 - 42
- Warhammer Armies: Empire (6th Edition) -- p. 12
- Warhammer Armies: Empire (5th Edition) -- p. 52
- Warhammer: Nagash -- p. 84-85