The Guardian Spear has been the signature weapon of the Adeptus Custodes since the time of the Unification Wars in the 30th Millennium, and in many ways their symbol of office. Elegant and deadly, it is a potent and unique design incorporating a Power Blade and a highly advanced integrated Bolter weapon, and in the hands of a Custodian Guard it can strike and parry at blinding speed despite its size. More rarely, these weapons mount not Bolters but advanced specialised sub-weapons such as compact Meltas or even Adrathic Disintegration Beamers, issued against the deadliest of expected foes.
Guardian Spears are also wielded by Deathwatch Watch Masters, the senior-ranking Astartes officers within the Ordo Xenos' Chamber Militant, the Deathwatch, who serve as the commander of a Deathwatch Watch Fortress or other Deathwatch headquarters installation. The fabled weapons carried by these elite warriors are symbolic of their roles as sentinel. This is a sign of great trust, for it is the same weapon borne by the Emperor's personal warrior elite, the Custodian Guard, yet modified to fire the signature shells of the Deathwatch which contain substances anathema to their targets. When a Watch Master joins the fight on the front line, he cuts down his foes with a cold precision that leaves monsters and tyrants slain in his wake.
- Guardian Spear - The most common type of weapon utilised exclusively by the Custodian Guard, the powered blade of this weapon is capable of hewing a Chaos Space Marine in two. This deadly weapon also incorporates a Bolt Caster, a double-barreled Bolter weapon able to strike at targets from afar. It can lay down a hail of fire, cutting down Traitors, Heretics and xenos threats with ease.
- Adrasite Spear - Incorporates an Andrathic Destructor.
- Pyrithite Spear - Incorporates a Melta Beam.
- Paragon Spear - The most beautifully wrought and deadly weapons of the Custodians' arsenal are the Paragon Spears which incorporate an in-built Paragon Bolter. These storied weapons are wielded by the most noted Shield Captains and Tribunes amongst the Ten Thousand of the Adeptus Custodes.
- Dreadspear - In addition to their standard armament, such is the dexterity and power of a Contemptor-Achillus Dreadnought, that they were able to wield scaled-up versions of the iconic weapon of the Custodes, known as a Dreadspear, with devastating power.
- Codex: Deathwatch (7th Edition), pp. 33, 52, 64, 74, 105-106
- The Horus Heresy - Book Seven: Inferno (Forge World Series) by Alan Bligh, pp. 117, 243-244, 262, 269
- The First Heretic (Novel) by Aaron Dembski-Bowden
- Burning of Prospero Imperial Datasheets