Xanathar's Guide to Everything
Monks of the Way of the Sun Soul learn to channel their own life energy into searing bolts of light. They teach that meditation can unlock the ability to unleash the indomitable light shed by the soul of every living creature.
3rd-level Way of the Sun Soul feature
Starting when you choose this tradition at 3rd level, you can hurl searing bolts of magical radiance.
You gain a new attack option that you can use with the Attack action. This special attack is a ranged spell attack with a range of 30 feet. You are proficient with it, and you add your Dexterity modifier to its attack and damage rolls. Its damage is radiant, and its damage die is a d4. This die changes as you gain monk levels, as shown in the Martial Arts column of the Monk table.
When you take the Attack action on your turn and use this special attack as part of it, you can spend 1 ki point to make the special attack twice as a bonus action.
When you gain the Extra Attack feature, this special attack can be used for any of the attacks you make as part of the Attack action.
6th-level Way of the Sun Soul feature
At 6th level, you gain the ability to channel your ki into searing waves of energy. Immediately after you take the Attack action on your turn, you can spend 2 ki points to cast the Burning Hands spell as a bonus action.
You can spend additional ki points to cast Burning Hands as a higher level spell. Each additional ki point you spend increases the spell's level by 1. The maximum number of ki points (2 plus any additional points) that you can spend on the spell equals half your monk level.
11th-level Way of the Sun Soul feature
At 11th level, you gain the ability to create an orb of light that erupts into a devastating explosion. As an action, you magically create an orb and hurl it at a point you choose within 150 feet, where it erupts into a sphere of radiant light for a brief but deadly instant.
Each creature in that 20-foot-radius sphere must succeed on a Constitution saving throw or take 2d6 radiant damage. A creature doesn't need to make the save if the creature is behind total cover that is opaque.
You can increase the sphere's damage by spending ki points. Each point you spend, up to a maximum of 3, increases the damage by 2d6.
17th-level Way of the Sun Soul feature
At 17th level, you become wreathed in a luminous, magical aura. You shed bright light in a 30-foot radius and dim light for an additional 30 feet. You can extinguish or restore the light as a bonus action.
If a creature hits you with a melee attack while this light shines, you can use your reaction to deal radiant damage to the creature. The radiant damage equals 5 + your Wisdom modifier.
Monastic Traditions version 4.0.0 by Laserllama
The Way of the Sun Soul originally published in the Sword Coast Adventurer's Guide has mechanics that do not live up to the fantasy of playing a radiant monk, but also do not work cleanly with the official rules of 5e. The Alternate version of Way of the Sun Soul seeks to fix both of these issues.
3rd-level Way of the Sun Soul feature
You have trained to focus your ki into bolts of searing light. Whenever you would be able to make an unarmed strike, you can replace the unarmed strike attack with a Radiant Bolt.
Radiant Bolts are ranged (30/90) monk weapon attacks that you are proficient in. On hit, they deal radiant damage equal to your martial arts die + your Dexterity modifier.
Finally, you learn the light spell, and you use Wisdom as your spellcasting modifier for it.
6th-level Way of the Sun Soul feature
You can channel searing blasts of radiant ki. As a bonus action, you can expend 1 ki point to force all creatures in an adjacent 15-foot cone to make a Dexterity saving throw against your Ki save DC. Creatures take radiant damage equal to four rolls of your martial arts die on a failed save, and half as much radiant damage on a successful save.
Upon reaching 11th level in this class, you can use this feature once per turn without expending a ki point.
11th-level Way of the Sun Soul feature
Your spirit brims with a luminous radiance that you can channel to purify the world. As an action, you can unleash a wondrous blast of radiant ki in a 5-foot wide, 100-foot long line, forcing all creatures within that area to make a Dexterity saving throw against your Ki save DC. Creatures take radiant damage equal to seven rolls of your martial arts die on a failure, and half as much radiant damage on a success.
You can expend ki points (up to your Wisdom modifier) to empower your Luminous Burst, adding one roll of your martial arts die to the damage for each ki point spent.
You can use this feature a number of times equal to your Wisdom modifier (a minimum of once), and you regain all expended uses when you complete a long rest. When you have no uses left, you can spend 3 ki points to use it again.
17th-level Way of the Sun Soul feature
At 17th level, you become wreathed in a luminous, magical aura. You shed bright light in a 30-foot radius and dim light for an additional 30 feet. You can extinguish or restore the light as a bonus action.
If a creature hits you with Your radiant spirit is a shining beacon of hope for all who stand and fight against evil. You gain the benefits below: