Martial Archetype
At 3rd level, a fighter chooses a martial archetype, and the Radiant Heart is another option for that feature.
Radiant Heart
As a Radiant Heart a spark of radiance has found its home inside of you through an encounter with a creature or artifact of tremendous radiant power such as a Deva, Unicorn or a portal to Mount Celestia. Radiant Hearts wield this celestial light to empower their weapons with blasts of radiant energy or protect their allies with healing light.
Ascending Radiance
3rd-level Radiant Heart feature
You can use a bonus action to manifest a pair of spectral wings from your back. They wings are not yet strong enough to hold you aloft, but any fall damage you take while they are summoned is reduced by five times your fighter level and they emit bright light in a 10 feet radius and dim light in a 10 feet radius beyond that. The wings last until you're incapacitated, you die, or you dismiss them as a bonus action.
Additionally, you have learned to infuse a portion of the celestial light within you into your weapons. When you make a melee weapon attack on your turn, your reach for it is 5 feet greater than normal, and on hit you can choose for you weapon damage dice to deal radiant damage instead of its normal damage type.
The bonus reach and bright light radius increases by an additional 5 feet when you reach levels 7, 10, 15, and 18.
Celestial Strike
3rd-level Radiant Heart feature
You can channel your inner light into your weapons and release it as a sundering blow. When you hit a creature with a melee weapon attack, you can deal an additional 2d6 radiant damage to the target, and leave them susceptible to damage. Until the start of your next turn, any time the struck creature takes damage, it takes an additional 1d4 radiant damage.
You can use this feature a number of times equal to your proficiency bonus and regain all uses when you complete a long rest.
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Blessing of Light
7th-level Radiant Heart feature
You can bring forth your light to heal your allies and yourself in times of need. When you use your Second Wind, you can choose an ally within 30ft of you to be healed for the same amount.
Additionally, your manifested wings have become stronger. While your wings are manifested, you have a flying speed of 15ft on your turn. You fall if you end your turn in the air and nothing else is holding you aloft.
Shine Against the Dark
10th-level Radiant Heart feature
The light within you shines bright enough to burn back even the deepest dark. The amount healed by your Second Wind increases by 1d10. Creatures damaged by your Celestial Strike cannot benefit from invisibility or being heavily obscured until the start of your next turn.
Aditionally, you manifest a second pair of wings. Your flying speed increases to 30ft. You still fall if you end your turn in the air and nothing else is holding you aloft.
Boundless Light
15th-level Radiant Heart feature
The light inside of you is boundless, and will not so easily run dry. Whenever you use your Action Surge, you regain one expended use of Celestial Strike.
Additionally, your wings are now strong enough to hold you aloft. You no longer fall if you end your turn in the air and nothing else is holding you aloft
Luminous Soul
18th-level Radiant Heart feature
The spark of radiance within you has grown into a beacon, that shines brightly through you. Your creature type becomes celestial, instead of humanoid.
When you use Celestial Strike on a creature, you can choose to deal its initial damage to any other creatures of your choice within 10 feet of the target. When you use your Blessing of Light on a creature, that creature becomes immune to damage until the start of your next turn.
Finally, you manifest a third and final pair of wings. Your flying speed increases to 60 feet.
