Black Knight is highly intelligent,well-trained with unarmed combatant and has a superb swordsman and an expert horseman. He is very proficient in science and technologies which includes mechanical and genetic engineering.Even without super powers he has very strong strategic and tactical skills making it his advantage.Source here
image sourceHis true name is Dane Whitman and has been an Avenger for quite awhile and did part ways with them when the battle with Kang is over and later joined MI-13.His past weapons includes the legendary Ebony Blade which was created by Merlin , forged with magic making it indestructible which can deflect energy and penetrate energy fields. Source here