Intense training, and talent, have pushed you to a level only matched by the greatest Demon Slayers in history. Not only are your physical abilities and senses pushed even further beyond their previous limits you have also gained abilities beyond what humans can usually do. You gain a demon slayer mark, its appearance is based on your breathing style, when active it boosts all your physical abilities and your breathing style's strength by 10 times but it also decreases your life span by 15 years every time you use it. You also gain the ability to see the Transparent World which allows you to accurately see the muscle, organs, bones, and blood flow of whoever you are looking at which will allow you to accurately predict their next moves in combat based on how they move and see any bodily weaknesses they may have, from weak knees to liver cirrhosis. When both previous abilities are used together, and you're in active combat you can unlock/use another ability, a red nichirin blade. This blade does notably more damage and counteracts regeneration through its extreme heat and super charged sun power, it is only able to be used with your sunburst steel weapon. With your abilities and power you can now take on high tier Upper Moons alone and with a group near your power you could even go toe to toe with a Demon King like Muzan Kibutsuji. Your combat skill is further improved with your weapon of choice.
You’ve been given also been given instruction in or developed more than just one style. You can freely switch between or blend the various breathing styles shown plus one of your own. You're also talented at learning and developing new breathing styles.