CAPTAIN AVALON

Brian's first appearance under Marvel's US office was Marvel Team-Up (1st series) #65. Cap originally used a amulet, a quarterstaff, and later a star sceptre to focus his powers, but the power of the sceptre was incorporated into his new uniform in Marvel Super Heroes #377, and his powers were enhanced even further by a life-enhancing fluid in #381. Up until this time, Cap could manipulate his force field, expanding it to cover other people, create hands of force energy, etc. After being killed in #388, Brian was resurrected by Merlin and Roma in The Daredevils #1 with his powers internalized, his force field much more limited in scope, and his senses enhanced. Braddock became Britanic in Excalibur (1st series) #75, and returned to being Captain Britain in #100. He lost his powers in Excalibur (1st series) #110, but regained them in Excalibur (2nd series) #4.

When Morgan Le Fay cast a spell of corruption on Captain Britain in Excalibur (4th series) #1, Brian passed the Amulet of Right on to his sister Betsy so Morgan wouldn't get his power. Brian was freed by issue #6, but his spirit was affected by the experience and he was visited by the Sword of Might instead of regaining the Amulet. He first wielded the power of the Sword to become Captain Avalon in issue #13. It's unclear what limitations this modified power set may have, such as reliance on his costume, his emotional state, etc.