Black Knight's powers come from his Inhuman lineage, however it is unknown if his powers originated at birth, or from exposure to the Terrigen Mists (either as part of the Inhumans' rituals or by being exposed to them when they were released into Earth's atmosphere later).
His powers are similar to that of his father, Black Bolt, in that he has a quasi-sonic scream. In essence, Black Knight can cause destruction with his voice. The actual strength of this power is unknown, however his voice was powerful enough to blast through the ground of Sentinel City to free Cable.
The power has been utilized through his own vocal chords and also through the "tuning fork" of his armor as well which allows the Knight more control over his abilities.
Adventurer; former royal guard
Avengers (Earth-9997), House of Agon (Earth-9997)
Iron Avengers (Earth-9997), Captain Britain's royal guard
Black Knight originally wore a suit of black armor that resembled that of Medieval Britain. The exact composition and durability of said armor was never revealed. When wearing this armor, Black Knight would typically use weapons of similar vintage, swords, javelins etc.
Later, he would dawn an armor resembling that of his late father, this suit of armor would be constructed out of Vibranium.
BASE OF OPERATIONS
Formerly Buckingham Palace, London, Britain
Earth X #9 (October, 1999)
Jim Krueger, Alex Ross, John Paul Leon
PARENTS AND RELATIVES
Blackagar Boltagon (Black Bolt, father, deceased),
Medusalith Amaquelin (Medusa, mother),
Maximus Boltagon (uncle, deceased),
Crystalia Amaquelin (Crystal, aunt, deceased)
Luna Maximoff (cousin)
Pietro Maximoff (Quicksilver, uncle by marriage, deceased)
Gorgon (second cousin)
Karnak (second cousin)
Triton (second cousin).
Inhuman powered by Terrigenesis