Reliable access to artifact class .... you are "The Fated Wielder"... or pick any of the epic destinies of 4e and tie them in with effects like 5e high end magic items. Yes if you have a magical blood line. Hell fast caster allowing spells to be cast in battle at all... might require a magical bloodline.... Circes bloodline includes it."Guy at the gym" would be ok if fighter had exclusive access to most martial weapons, magic weapons, and magic armor like in 0e, 1e, and 2e. If Joe Schmoe the Fighter has exclusive access to Mjolnir, Excalibur, Gunfire, Thunderbolt, Fragarach, Muramasa, the Power Sword, the Power Bands, Stormbringer, Nemean Lionskin, Aegis, Ice, or Anduril, that's a nice constellation prize
Sigh because nothing can be extreme exertion limited or a product of character luck, (or situational narrative power granted the player) /s.If Fighters could do things spellcasters could do at will, they would be "magical anime Fighters" and the game would implode! : )
One could narrate many effects without anything more than hit point loss it was the one true way in AD&D but the instant you get other mechanics and tactical choices ... nope nope nope.