Durand earned his title largely because of the nature of his energy and abilities.
He did not possess powerful fire, fierce lightning, or violent gusts of wind that obeyed his will. Nor could he control light, blood, or gravity on land.
Technically, his element wasn't even darkness, but death and corrosion.
If Adam were here now and saw what had happened to Kamora's hand, he would surely recall an old but important adversary from his path - the Plague Reaper.
If the Plague Reaper were on Durand's level, he could have done something similar to Kamora's hand. However, that didn't mean Durand and the Plague Reaper had the exact same abilities.
Durand knew the strengths and weaknesses of his abilities, and he had been through enough battles to anticipate an enemy's reaction to his actions.
