The highest rank possible in the Demon Slayer Corps, you are now a Hashira level combatant in whichever breathing styles you use. You've mastered the form to the point where you can even improve the breathing style itself, with effort and practice. You're a master of Total Concentration Breathing Constant as well as necessary breathing abilities, such as the healing breath, like other Hashira. All your physical abilities are pushed to their pinnacle and your senses are enhanced beyond normal human limits. You can take on strong demons like Lower Moons on your own but would need significant help for any Upper Moons, currently at least, one day you may be able to fight the weaker ones on your own. Whichever sense you boosted previously has been further enhanced and your breathing form no longer takes a harsh toll on your body, Sun Breathing is an exception though even its dangers are weakened. You also gain master level skill in your weapon of choice.