The Haazareth Three are a trio of demons who amuse themselves through granting power in exchange for sacrifices. They provided Doctor Doom with mystical power. As part of his bargain, he took the soul of his old lover Valeria by placing a special necklace on her. In exchange, the Three gave him a mystical armor.
However, Mister Fantastic and Doctor Strange tricked Doom into boasting, and the Three angrily grabbed Doom through the Orb of Agamotto to their dimension. The Fantastic Four followed and were able to free Franklin.