The Adeptus Custodes is the Imperial organization responsible for guarding the Imperial Palace and the physical body of the Emperor of Mankind. They are a group of 10,000 genetically-engineered superhumans that serve as the Emperor's personal guardians. Since the Emperor's interment in the Golden Throne following the Horus Heresy ten millennia ago, they have taken a far more limited role in the Imperium. They never leave Terra and only very rarely leave the Imperial Palace. It is only the Adeptus Custodes that decide who may enter the throne room of the Emperor, and when they may do so.

Organization
The Adeptus Custodes is a department of the Adeptus Terra, the overall Imperial government, but its members are answerable only to the Emperor and their own leaders. The organization's leader carries the title of Captain-General, and due to the importance of the Adeptus Custodes he often holds a position among the High Lords of Terra

Appearance
The Custodes are slightly larger and stronger than even Space Marines. Custodian jetbike squadThe uniforms of the Custodians are traditional but effective: boots, leather breeches and long black cloaks. Their torsos are naked and corded with tattooed muscle. Their tall, brazen helmets, ominous and all-enclosing, give them a threatening and impersonal appearance; ancient and ornate, the helmets incorporate advanced protective equipment and communicators. Originally the traditional colour of the Custodes was red; following the confinement of the Emperor after the defeat of Horus, it was changed to black, the colour of mourning. The weapons carried by the Custodes resemble spears, but in fact they are laser weapons built into the shape of spears. The spears are built to resemble the original guardian spears, carried by the Adeptus Custodes before the Emperor's confinement. The guardian spear is closely associated with the Custodes, and is depicted on their banners and badges.2, 4, 5
History
he Custodes were founded by the Emperor of Mankind at an unknown date during the Unification Wars on Terra, following the Age of Strife. Nevertheless, during that time, they were not yet known as the Adeptus Custodes, but as the Emperor's Companions.

They are the 'Dread Guardians', and the only living beings permitted to walk beside the Emperor. The Custodes were the greatest group of physiologically and psychologically-enhanced troops the Emperor had ever created, ten thousand strong and the best trained, most disciplined and most vigilant watchmen in the Imperium. Now ensconced deep within the Sanctum Imperialis on Terra, they watch over the corporeal body of the Emperor.

Before the Horus Heresy, a unit of Custodes used to accompany the Emperor at all times, even when he retired to his private chambers. During the Great Crusade, these great warriors always kept a contingent with the Emperor for his protection, but also traveled individually as his personal envoys. Even in the days before the Heresy, it was a rare and blessed thing to see a member of the Adeptus Custodes, and due to the confinement of the Emperor to the Golden Throne, it has become an almost unthinkable event. Even during the Heresy, a group of Custodes joined the Emperor during his assault upon Horus' flagship, the Vengeful Spirit.

Since the death of Horus and the mortal wounds he inflicted upon the Emperor, the Adeptus Custodes have taken a more limited role as protectors of the physical form of the Emperor on Terra.

The Adeptus Custodes were instrumental in the ending of the rule of High Lord Goge Vandire and the Age of Apostasy. It was the actions of a few members of the Adeptus Custodes, utilising secret passages known only to themselves, which caused the Sisters of Battle, then known as the Brides of the Emperor, to realise the acts of base treason perpetrated by Vandire. After their leader, Alicia Dominica, was brought before the Emperor by the Custodes, she returned and executed Vandire for his apostasy.

Outlook and training
Although the Custodes were among the first genetically-modified warriors to be created by the Emperor, they were never intended to be part of a conquering army; such a role was to be filled by the latter Adeptus Astartes armies. This is revealed both in their mindset and training: While Custodians share a genetic kinship with one another within the formation, they do not foster the same spirit of brotherhood that is instilled within the Astartes in order to function together as a unit. Indeed, each Custodian prepares and inspects his equipment individually, rather than on military parade.3 The individuality of each Custodes is further promoted by the fact that the processes required to produce them is not as refined or as simple as that of the Astartes 3 and thus they are not "mass-produced" as the Astartes are; meaning that each Custodian is a unique investment for the Imperium. One ritual that the Custodes do share is the recognition of mighty deeds, manifested in the awarding of names, which are added to the Custodian's title to represent the actions he has performed in service to the Emperor. (Constantin Valdor obtained 932 names prior to the assault of Horus upon Terra)3 Such names were inscribed onto the inside of the warrior's battle armour as marks of individual pride. The training of the Custodes also differed immensely from the Adeptus Astartes, since they were intended to be bodyguards rather than soldiers. It is clear from their Blood Games that Custodians are trained in the arts of assassination -- both improvised and professional -- in order to counter possible assassination attempts on the Emperor. It is common for several Custodians to be on detached duty for these Blood Games so that the organisation remains vigilant against developing threats.3 Furthermore it is clear that the Custodes are also well-versed in the political etiquette of Terra, and have been known to act outside of Imperial law, to infiltrate influential Noble Houses and to investigate any potential threats.3 (A role that a Space Marine would never be expected to fulfil.) This aspect of the Custodian mindset is advantageous, given that the Captain-General of the order often shares a seat with the High Lords of Terra and thus allows him to navigate the political maneuverings of the Imperium's various agencies, while still remaining an awe-inspiring warrior.
Role and Capabilities

The similarities in form between the Adeptus Astartes and the Adeptus Custodes indicate the two groups may be related, although it has never been confirmed that members of the Adeptus Custodes undergo the rigorous genetic change in the same way as the members of the Adeptus Astartes. It was implied in False Gods that the creation of a Custode was a long and arduous process, utterly different from the creation process of a regular Astartes and much costlier, thus their relatively small numbers. They have the final word on security in the Imperial Palace, and even the High Lords of Terra are subservient to them within its walls.

The Custodes are warriors unmatched in the galaxy, genetically-engineered by the Emperor himself. The Emperor engineered few of these warriors as the swifter method using Space Marine gene-seed became more viable.

The martial capabilities of the Adeptus Custodes remain largely unknown. What is known is that they possess skill beyond even a 'normal' member of the Adeptus Astartes. It has been said that the Adeptus Custodes are to a Space Marine what a Space Marine is to a member of the Imperial Guard. They are similar to the Grey Knights, the militant arm of the Ordo Malleus branch of the Inquisition, in that both are elite, secret organisations with close ties to the Emperor. Custodes are unique as they have neither a known Primarch nor do they use gene-seed to produce their genetic modifications. They stand a full head taller than a Space Marine and it iis said that they were almost the same size as a Primarch. In fact it was said that Constantine Valdor, Chief Custodian to the Emperor during the Horus Hersey, was the same size as the traitor Primarch Alpharius of the Alpha Legion.

Although their numbers remain unknown, three hundred Custodes guard the Emperor's chambers at all times.

Only three hundred of the Adeptus Custodes serve as the actual personal guard of the Emperor, called the Companions. These are those Custodes that are privileged enough to be in the Emperor's physical presence. Each unit of Companions is led by a Centurion. It was one such Centurion that led a small group of Companions to meet Alicia Dominica, head of the Brides of the Emperor (later Sisters of Battle) during Vandire's Reign of Blood.[2] One such Custode, Constantine Valdor, was the Chief Custodian during the Horus Heresy. He was the most honoured of all the Emperor of Mankind's creations. No other being had served the Emperor for as long as he, save Malcador the Sigillite. Valdor was a proud and respectful warrior unmatched in his devotion and loyalty to the Emperor. Valdor was ever-present at the Emperor's side, always protecting him from unseen enemies and saving the Emperor's life innumerable times. Along with Malcador, Valdor was his most trusted friend and advisor.

Constantine Valdor was one of the first High Lords of Terra. He also had a close relationship with the Primarchs Rogal Dorn and Leman Russ, although initially Russ and Valdor didn't see eye to eye. Dorn was ever-present at the Imperial Palace during the great Crusade and so Valdor and the Primarch spent much time together. On the other hand, Valdor only earned Russ's respect when the former defeated Horus in a sparring match. The two were then together during the Battle of Prospero. There is no mention of when or how Valdor was killed if he was killed at all. He stepped down from command as a High Lord so that he could protect his beloved Emperor, now ensconsed within the Golden Throne.

Dan Abnett's Blood Games, however, provides a different version of the relationship between the Astartes and Custodes. Abnett claims that, though Custodians are slightly larger, on average, than Space Marines, their fighting skills are more or less equal. Abnett also points out that while Space Marines don their armour ritually and in the presence of their squadmates in order to focus themselves entirely on their martial calling, Custodians arm themselves alone and in silence, reflecting on the varied duties they must perform in the service of their master. As bodyguards, the Custodes not only protect the Emperor's person but also maintain scrupulous surveillance on all the Imperial factions, infiltrate the households of suspicious individuals, and enter deep cover to test the tightness of their own security net, an exercise known as a Blood Game. Furthermore, Abnett states that each Custodian's name consists of numerous components typically awarded for feats of arms; Valdor's full name, for instance, is over nine hundred components long.

Equipment
Pre-Heresy
Recent conversion modeling done by Games Workshop staff on the official website[3] show the Adeptus Custodes as wearing gold coloured armour. These superior warriors can be seen adorned with all manner of lightning bolts (the symbol of the Emperor during the Unification Wars on Terra prior to the use of the Imperial Aquila), aquiline and knightly crosses. Little is known of the equipment and capabilities of such a secretive organisation, but the visual sources (such as a diorama of the Golden Throne within the 3rd edition rulebook) give the impression of immensely ornate armour. Custodians are typically seen with a Guardian Spear which, in the days before the Horus Heresy, was a combination of force halberd with boltgun. A gladius is normally seen at their side. Players wishing to convert and play a Heresy or Crusade-era Custodes army are encouraged to use the Grey Knight rules laid out in the codex. The Custode Gaius Commodus carries a modified version of the Guardian Spear. It is rumored that the spear itself was a relic given to him by Constantine Valdor.
Present
Before the Emperor's interment in the Golden Throne, the Custodes had access to the same equipment as the Legions of the Space Marines. However, since then they have taken a far more limited role, and almost never leave Terra and only very rarely leave the Imperial Palace. Accordingly (although the Imperial Palace covers a vast area), their equiptment choices would be limited to what is necessary to defend the Palace.
Rogue Trade
In Rogue Trader (Warhammer 40,000 1st edition) the Custodes were the Guardians of the Emperor and the Imperial Palace. They wore simple but effective clothing: boots, leather breeches and a black cloak, their torsos were naked and corded with tattooed muscle, and in keeping with the current edition, they carried laser spear-guns said to have been built to resemble the traditional Guardian Spears. Their helms were tall and ornate works of art, impassive and giving the Custodes a threatening appearance. According to the stats given for them, they were superior to the Astartes of the time, although not as loyal.
Known Custodes

* Chief Custodian Constantin Valdor, commander of the Legio Custodes during the Great Crusade
* Amon Tauromachian
* Haedo
*taken from the warhammer 40k wiki.

Custodes Squad - 250 Pts (Troop Choice)

Custodes:

WS:5 | BS:5 | S:4(5) | T:4 | W:1 | I:5 | A:2 | Ld:10 | Sv:+2/+4

Centurion:

WS:5 | BS:5 | S:4(5) | T:4 | W:1 | I:5 | A:2 | Ld:10 | Sv:+2/+4