Emperor's Sword

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Note the burning sword in His right hand, which has drunk the blood of many a xenos.

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

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

The Wiki states thus: The Emperor's Sword, also called the Sword of the Emperor, is a famed relic blade that was wielded by the Emperor of Mankind Himself during the Great Crusade and was eventually passed on to the resurrected Primarch Roboute Guilliman in 999.M41 by the Archmagos Dominus Belisarius Cawl in the wake of the 13th Black Crusade and the Ultramar Campaign, just before he assumed the mantle of Lord Commander of the Imperium for the second time. The weapon had been kept safely in Cawl's possession on Mars for over 10,000 standard years, since the end of the Horus Heresy and Guilliman's first tenure as the Lord Commander. Touched by the Emperor's own psychic might, this finely wrought, master-crafted blade is lit from hilt to tip with leaping flames. When it is swung, the burning blade draws pyrotechnic arcs through the air, able to slice through the stoutest of armour with ease.