You place one bare hand on the luminous blade of Dawnbringer or a Sun Blade, the other you extend towards your target.
A creature of your choosing within 100 feet of you must make a Constitution saving throw. The creature takes 6d10 radiant damage on a failed save and is blinded for 1 round. On a successful save the creature only takes half damage.
Until the start of the creature's next turn, it is illuminated by motes of sunlight and sheds dim light in a 10-foot radius. Any attack roll against an effected creature or object has advantage if the attacker can see it, and the affected creature or object cannot benefit from being invisible.
Magical darkness is dispelled along the 100 foot long, 5 foot wide path of the channeled beam.
You take 3d4 radiant damage.
When you cast this spell using a spell slot of 4th level or higher, the damage to the creature increases by 1d10, and the damage to you increases by 1d4 for each slot above 3rd.
"The hubris of Icarus may see you through the dark, but at what cost?" - The lost journal of Vein Hepatros
* - (Must be touching the blade of Dawnbringer or a Sun Blade)