- "Only the Faithful" - warcry of the Hallowed Knights.[4a]
The Hallowed Knights are the fourth Stormhost of the Stormcast Eternals to be founded. They wear burnished silver armor. The Hallowed Knights are zealous and loyal to Sigmar and their absolute faith in them is absolute. To them the war against Chaos is a sacred crusade for which no sacrifice is too great. They are so pure of spirit and filled with so much holy fervour that they fear no evil and evil magicks have little hold on them. 
They were recruited from all of the Mortal Realms, from those warriors that devoutly worshipped Sigmar. Those who called upon Sigmar's name in battle while fighting for a righteous cause. Taken to the Realm of Heavens they were told by Sigmar that he would not aid them, but rather they who could further serve their god.[4a]
"Much is demanded of those to whom much is given" - First Canticle of the Hallowed Knights.[4b]
War of Life
An audience with Nagash
Tarsus Bull-Heart led a force of the Bull-hearts Warrior Chamber in the Realm of Death, seeking the Starless Gates, also called Nine Gates of Stygix, and an audience with Nagash. To reach his goal, Tarsus freed Mannfred von Carstein from the Bloodbound, clutching a pact with him.
After defeating more Bloodbound and freeing Ashigaroth too, Mannfred and the Hallowed Knights crossed a desert made of blood reduced to powder, also rescuing a bunch of pilgrims from other Bloodbound led by a champion called Gorewolf. Seeing the coming of an immense sandstorm, they marched to the temple of Final Rest to take shelter. The temple was inhabited by about seventy vampire priests, who allowed the pilgrims to live in return for blood. These vampires once fought to protect the pilgrims from the forces of Chaos, so they rewarded them with blood. With the return of the Bloodbound, Tarsus sought the help of the vampires, but they explained they would never have fought again. Mannfred and the Hallowed Knights held the Bloodbound at bay outside and inside the temple, but the heat of the battle revealed the true nature of these vampires. Some of them transformed in Varghulfs, which killed Gorewolf and knocked down Tarsus. Mannfred drove Varghulfs back and saved Tarsus. After the end of the storm, Mannfred and the Hallowed Knights left the temple and continued their journey.
They arrived at Helstone, a huge city with ninety-nine underground levels in which they were ambushed by Nurgle Beastmen. After defeating them, Mannfred described Helstone as a city destroyed by the force of Chaos after Nagash was defeated by Archaon at the Battle of Black Skies. Nevertheless, Helstone wasn't deserted, but it was infested by ghouls. Mannfred explained the Gates of Styigix had no fixed position, but they shifted places every nine moons, so they needed an artifact hidden in Helstone. To find the artifact, Mannfred took control of ghouls, ordering them to look for it, while Tarsus and Hallowed Knights set a camp to rest and wait. The peace wasn't long, because Nurgle's followers returned, this time with Blightkings and a Nurgle sorcerer. The battle was hard and Tarsus thought Mannfred had betrayed them, but the vampire soon returned with his ghouls. Raising more undead warriors, the Hallowed Knights successfully repelled their enemies and Tarsus killed the Nurgle sorcerer on top of a tower. The battle was over and Mannfred had found the artifact. After the battle, Tarsus recovered his memories from his life before he was transformed by Sigmar. He recalled being prince Tarsem of Helstone and he understood why he trusted Mannfred although he was a vampire. Mannfred was there, fighting alongside the people of Helstone, then he escaped and Tarsem died praying Sigmar while facing a Bloodthirster. He recalled all his memories before being reforged, but he didn't want to share them with Mannfred, so they went on, leaving Helstone behind them.
After travelling across wastelands and mountains, the Hallowed Knights fought Chaos followers once more, but this time there weren't only Bloodbound. Khorne Bloodbound fought Nurgle Rotbringers who in turn fought Tzeentch followers. Following Mannfred, Tarsus and his Stormcast avoided combat, finally finding the gates to the Underworld. Nonetheless, these gates weren't unguarded. The first Khorne Bloodbound who tried to surpass them were still there, killed and turned in wights by Nagash, taking the name of Desolated Legion. Mannfred tried to control them, but it was useless. Reduced to only sixty Stormcast, they were forced to fight again. They had to retreat into the archway of the gates, looking for another way. They found the Bridge of Seven Sorrows, but Nagash's gatekeeper awaited them. It was Arkhan the Black, who refused to let them pass and awakened the spirits of the seven queens of Skull Isles, seven fearsome banshees. The Stormcast clashed with the seven queens while Mannfred fought Arkhan, until Nagash arrived. He didn't want to hear words from Sigmar, calling him a deceiver, a barbarian and a traitor. He only wanted to know the secret of Stormcast creation because every soul sent to Sigmar was a soul fewer to Nagash. That process was weakening Nagash and that was unacceptable for him. Nagash killed almost all the Stormcast, but Nagash prevented their souls from going back to Azyr. Tarsus told Mannfred o flee again, like he did in Helstone. Mannfred obeyed, but he was astonished by the sudden revelation. Tarsus eventually managed to distract Nagash, freeing his comrades' souls sacrificing himself. Nagash wasn't pleased and he was still enraged with Sigmar. He said he would have known his secret and that his 9999 legions gathered in darkness by his Mortarchs.
The Sepulchre of the Faithful
All Stormhost have their mausoleum, but the Hallowed Knights call it Spulchre of the Faithful. It's a place of quiet contemplation, where the truly dead are honoured and the memories of their mortal lives are recounted and recorded so that even if they forget, those moments are not lost.[13a] The vast antechamber has bas-reliefs of intricate craftmanship, massive pillars inscribed with the Canticles of Faith, ornate lanters and great ironbound books chained to stone shelves along one wall. They're the Books of the Faithful, containing the mortal memories of every Hallowed Knight. Every member of the Stormhost can read them, but the Lord-Relictors have the duty to protect and add memories to them.[13a] The inner chamber of the Sepulchre of the Faithful has an enormous pillar of pale stone, said to have been carved from purest celestine by the claws of Dracothion himself, and chiselled into its present shape by the ancestral tools of the greatest masons of the Dispossessed. The pillar has no decoration, but it has several sigmarite spikes hammered into its surface, one for every Hallowed Knight truly dead, never to be Reforged. When a new spike must be added, many Hallowed Knights gather inside the inner chamber and a Lord-Relictor bless the spike in the name of the lost Stormcast, then he drives it in the pillar using his hammer.[13a]
- Stormforged: Fought to reach the rim-citadel of Yatlan.
- Bull Hearts: Fought on the Realm of Death looking for the Starless Gates.
- Steel Souls: Fought in the War of Life.
- Gleaming Host
- Gardus Steel Soul - Lord-Celestant of the Steel Souls.
- Feros - Reributor-Prime of the Steel Souls.[8a]
- Tegrus of the Santed Eye - Prosecutor-Prime of the Steel Souls.[8a]
- Solus - Judicator-Prime of the Steel Souls.[8a]
- Lorrus Grymn - Lord-Castellant of the Steel Souls.[8a]
- Morbus - Lord-Relictor of the Steel Souls.[8a]
- Angstun - Knight-Vexillor of the Steel Souls.
- Aetius Shieldborn - Liberator-Prime of the Steel Souls.[8a]
- Tarsus Bull-Heart - Lord-Celestant of the Bull Hearts.
- Ramos of the Shadowed Soul - Lord-Relictor of the Bull Hearts.[13a]
- Tornus the Redeemed - Knight-Venator. Formerly known as Torglug the Despised.
- Silus the Untarnished - Lord-Celestant of the Gleaming Host.[13a]
- Targonaut - Lord-Celestant of the Chamber Resplendent.
- Lady Cassandora Stormforged - Lord-Celestant of the Stormforged, she struck down the Queen of Swords and led her chamber to claim the rim-citadel of Ytlan in the Crater War.[13a]
- Iorek Ironheart: Lord-Celestant of the Ironhearts.[13a]
- Cerberac Darkfane: Lord-Relictor of the Ironhearts.[13a]
- Kadarius Stonehold: Lord-Castellant of the Ironhearts.
- Kaldon the Bold: Knight-Vexillor of the Ironhearts.
- Lomas: Knight-Heraldor of the Ironhearts.
- Phantus the Skyreaver: Knight-Venator of the Ironhearts.
- 1: Warhammer: Age of Sigmar Primer, the Pageantry of War
- 2: Assault on the Mandrake Bastion by Josh Reynolds
- 3: White Dwarf Issue 76 11 July 2015, a New Era Begins!
- 4: Mighty Battles
- 5: The Prisoner of the Black Sun by Josh Reynolds
- 6: Sands of Blood by Josh Reynolds
- 7: The Lords of Helstone by Josh Reynolds
- 8: The Realmgate Wars: War Storm
- 8a: The Gates of Dawn by Josh Reynolds
- 9: The Bridge of Seven Sorrows by Josh Reynolds
- 10: Battletome: Stormcast Eternals Extremis
- 11: The Realmgate Wars: Balance of Power
- 12: The Realmgate Wars: All-gates
- 13: Hallowed Knights: Plague Garden by Josh Reynolds
- 13a: Chapter 1
- 14: White Dwarf Issue 86 19 September 2015
- 15: White Dwarf Issue 91 24 October 2015
- 16: Battletome: Stormcast Eternals (2017), Stormhosts, pg. 136