The Witch King took the Circlet of Iron from the rubble of an abandoned pre-human city. It is said to be older even than the ancient High Elf race, and it is a potent source of magical power.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Arcane Item
Once per Magic phase (yours and your opponent's), Malekith can use the Circlet of Iron to add a single bonus dice to any of his failed casting or dispel attempts. This bonus dice can contribute to irresistible force (and a miscast).