The Ancient Walkers described him as "standing alone", meaning that he does not team up with other magic users as or more powerful than himself. His only companion is a rather weaker magician known as the Enchantress, a rabbit whom he may or may not be romantically attached to given their alliance.
Formerly a resident of Angel Island's Forbidden Zone, Black Death attacked Knuckles when the Guardian came looking for him, keeping him off balance with dark magic attacks long enough for the Enchantress to place a spell of domination upon Knuckles. The two then used Knuckles as their slave for some time, until Sir Connery arrived to capture them as part of his mission from the Ancient Walkers. Knuckles, after having broken free of the spell, faced off with Black Death and managed to trick him with some sleight-of-hand -no doubt learned from his mentor Archimedes and knocked him unconscious. Connery then took the defeated sorcerer and the Enchantress away, possibly later slaying them as he did their fellow dark magic wielders Mathias Poe and Damocles the Elder.
- The Black Death was a major pandemic that spread through Europe in the 14th century which killed about one third of Europe's population.