I got hooked on the Black Knight's story because that blade feels like the ultimate tragic prop — beautiful, powerful, and absolutely poisonous to whoever holds it. In the earliest Marvel retellings the Ebony Blade is forged from a fallen star or mysterious meteorite by Merlin to serve Camelot, and it's later wielded by Sir Percy and then by modern heirs like Dane Whitman. The curse most writers lean on is that the blade carries a malign enchantment: it grows stronger with
bloodshed and carries the taint of those it kills, which backfires on the wielder by stoking bloodlust, guilt, and sometimes madness.
Different eras of comics play the curse differently. Sometimes the blade simply amplifies violent impulses, making a good person act cruelly; other times it actively compels murder or binds itself to the wielder's soul so the mental scars can’t be escaped. Morgan le Fay is often named as the one who cursed it — out of
Envy, spite, or revenge — which gives it a very mythic, Arthurian bitterness. Also, narratively, writers use the curse to explore themes: responsibility, the cost of power, and whether heroism survives when your tools corrupt you.
For me the tragic angle is what sticks: Dane Whitman is brilliant and heroic, but he’s always fighting this literal and metaphorical sword that wants him to fail. It makes every victory taste a little hollow, which I find oddly satisfying in a dark, medieval way.