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Adur was an already powerful leader among his people, but he began using human sacrifices in attempts to gain dark power and ultimately became immortal, and gained the ability to manipulate fire. He formed the Deathwalkers along with Cairn, Lichidus and Viciada, people with similar origins to his, and worked together to gain more power.
Since old times, they tried to use the Talisman of Kamar-Taj to create a sacrifice so powerful it would destroy humanity. A failed attempt in 1908 caused the creation of The Bear. In 1972, one of their attempts to make the sacrifice was thwarted by the Mighty Avengers. The Talisman was taken from them and it was hidden in the Himalayas by Kaluu. The Talisman made its way to the Inhumans' Attilan.