The artefacts of Vulkan are nine artefacts forged by the Primarch Vulkan, the only survivors of what was once a vault of thousands. Of these, seven were chosen by the first Forgefather, T'kell, whilst the other two were carried by Vulkan to Isstvan V.
The Nine were, according to Salamanders lore of the 41st Millennium, scattered throughout the galaxy, and the Tome of Fire gives clues as to their locations. The one tasked with finding these artefacts is a Captain from one of the companies. He renounces his name and takes his Primarch's name, Vulkan, and is given the title of Forgefather. So far, 5 of the artefacts have been located.
Before heading to battle against Horus following the events at Isstvan III, Vulkan traveled to Prometheus to meet with Forgemaster T'kell. After discussing how weapons can be abused, and how Horus's fall represents that even the best of them could fall, Vulkan decides that he must destroy all of his artefacts, the weapons he was created to make. Vulkan takes T'kell into his vault and allows him to see many weapons, ranging from simple blades to mighty machines, created within. Vulkan tasks T'kell with their destruction, but T'kell pleads, saying that they represent Vulkan's legacy and could possibly be used for good just as they could be used for evil. Vulkan relents on the order, declaring that T'kell would be his Forgefather, bound to Nocturne and unable to travel with them to Isstvan V.
This disturbs T'kell, but Vulkan allows him to choose 7 artefacts which he would preserve as the legacy: the Unbound Flame, Obsidian Chariot, Spear of Vulkan, Song o