The Arkantaash is a goblin artifact dating back to before the daelkyr war.
Forged by the elves of Aerenal, the Crown of Remembrance was a powerful artifact with powers over death. It is said it could allow to consult them on subjects of importance and even to bring them back to life. It was brought to Khorvaire by the Valaes Tairn elves and lost during their evacuation.
It resurfaced years later as the Ashen Crown in hobgoblin hands. They found a way to disassemble it into four pieces and added a fifth: Ashurta’s Blade. It was used by five hobgoblin warlords during the Dhakaani’s war against the daelkyr and lost when the Empire crumbled.