Lightwalker

Many warriors find that mere physical prowess is limiting their abilities. Some of these choose the path of the Lightwalker, a warrior who uses the power of illumination to run rings around their enemies. Also called Luminants or Sunbursters, a Lightwalker’s radiant powers grant them unparalleled control of the battlefield. 

Glimmering Edge

At 3rd level, you begin to exert your will over the natural radiance around you. You learn the light cantrip, and it has a casting time of 1 bonus action when you cast it. When you cast it on a simple or martial melee weapon, you can change that weapon’s damage type to radiant for the duration of the spell.

Additionally, whenever a creature within 60 feet of you that you can see takes radiant damage, you can use your reaction to grant that creature vulnerability to that damage. Once you use this feature, you can't use it again until you finish a short rest.

Blinding Flash

Also at 3rd level, you have limited influence over the luminance of nearby lights. As a bonus action, you cause one light source that you can see within 60ft of you to flare with radiance. Each creature other than you within 30ft of that light that can see it must make a Constitution saving throw (DC 8 + your proficiency bonus + your Wisdom modifier). On a failure, it is blinded until the end of your next turn. On a success, it suffers disadvantage on the next attack roll it makes as spots of light blink in its vision. 

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest. 

Flickering Passage

At 7th level, you can flash across the battlefield faster than blinking. As a bonus action, you vanish in a flash of light and reappear up to 30ft away in a unoccupied space you can see in daylight or within 10ft of a source of bright light.

Alternatively, you can use this feature as part of your Blinding Flash. When you do so, you can teleport to any unoccupied space you can see within 60ft of you. 

Awaken Candour

At 10th level, you can engender the light of truth through your mere touch. As an action, you can touch a source of light and awaken it for 10 minutes. While awakened, the radius of bright and dim light from the source doubles, and creatures within the bright light from the source cannot speak a knowing lie. Charisma checks directed at those creatures have advantage. 

In addition, you can use your Blinding Flash on an awakened light source without expending a use of the feature. 

Incandescent Barrier

Starting at 15th level, your body can metabolise the nourishing light around you into a radiant shield. You gain resistance to radiant damage, and once each turn when you take or deal radiant damage you can choose to gain temporary hit points equal to that damage.

Lightspeed

At 18th level, the ambient light infuses your body. Your speed is doubled as long as you are in an area of bright light, and whenever you use Blinding Flash you gain a +2 bonus to your AC until your next turn.