Emperor's Sword

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Note the burning sword in His right hand, which has drunk the blood of many a xenos. It appears to be so powerful that it is warping the Emperor's foot behind it.

40k Guilliman currently wields daddy's choppa

"...when the Evil Spirit assailed the creation of Good Truth, Good Thought and Fire intervened."

– Yasht 13.77, from a collection of 21 Zoroastrian hymns

The Emperor's Sword was used by Himself during the Great Crusade and by Primarch Roboute Guilliman as of the 42nd millennium.

The Emperor's Sword is a relic of unknown origin that dates back to at least the Great Crusade. It has some super-special-powers that are unique to it (see below), and is, almost as importantly as of 8th Edition, a plot device to show that Guilliman is the rightful commander of the Imperium after Belisarius Cawl gives it to him at the end of M41 - in a way, it is the symbol of office for the ruling monarch of the Imperium, and make Guilliman's claim indisputable.

Obviously, this sword has a lot of meaning and importance for not just the Imperium at large, but also for many special characters, in particular in the books. When Dante is having prophetic visions during Devastation of Baal, he sees the Emperor in His throne without the sword, which freaks him out immensly, and kept pondering upon the implications of that vision for a while. This was resolved once the battle ended, after seeing Guilliman wielding the sword, and realizing the visions did not mean catastrophe, but the return of the Primarch. In Dark Imperium, Guilliman also reflects about the nature of the sword, and whether its properties are of divine or mundane nature, seeing as they are capable of banishing daemons even he would've struggled with if he hadn't had Daddy's sword. This, combined with his view on the Emperor's humanity-divinity (on top of all the shit he has to worry about in the book), makes him quite stressed out and melancholic of better times at the end of the book.

According to the sources, the blade is not only a powerful weapon in its own right, but it also has some of the most powerful cleansing abilities seen to date. Capable of dispelling Chaos energies and banishing daemons with ease, in point of fact, it can permakill them, annihilating their souls so they are no more, forever. This blade was probably made by the Emperor to specifically fight the malevolent forces of the Warp, and probably saw a lot of use during the War in the Webway, during the Horus Heresy. It also has a lot of similarities with the Spear of Russ, a weapon used by Leman Russ during the Battle of Trisolian that showed similar anti-chaos abilities, managing to de-corrupt Horus for a brief moment of time. Or more relevantly, Ghal-Maraz, the signature weapon of Emps' Fantasy Counterpart Sigmar, which has shown similar anti-chaos abilities to the point where it can convert Chaos Champions back to the side of order.

Considering how big of a McGuffin the Emperor's Sword is being in recent books, it's pretty safe to say Black Library probably has something prepared for it in the not-so-distant future.

It has no name. It needs no name.

It is the Emperor's Sword.