Base Class: Paladin
Paladins that follow this Oath aim to embody both aspects of the sun. Their temper often shits erratically and their wrath especially burns bright.
Channel Divinity
When you take this oath at 3rd level, you gain the following two Channel Divinity options.
Glorious Radiance. As an action, you can begin radiating bright sunlight. While this effect is active, you shed bright light out to a radius of 30 feet. Additionally, you gain a number of temporary hit points equal to your paladin level + your Charisma modifier. If a creature hits you with a melee attack while you have these hit points, you can use your reaction to deal 5 points of radiant damage to it. This effect lasts for 1 hour, until the hit points are expended, or until you dismiss it. When you reach 9th level, the effect deals 10 points of radiant damage, and at 17th level, it deals 15 points of radiant damage.
Solar Flare. As an action, you can emit a blinding flash of light. When you do so, all creatures you choose within 20 feet of you must make a Dexterity saving throw or be blinded for 1 minute. An affected creature may make a Constitution saving throw at the end of each of its turns to end the effect.
Aura of Sun's Warmth
At 7th level, you and all friendly creatures within 10 feet of you have resistance to fire and cold damage, and can tolerate temperatures as low as -50 degrees Fahrenheit and as high as 300 degrees Fahrenheit. Additionally, when you deal fire damage, you can choose to deal radiant damage instead, or vice versa.
At 18th level, the range of this aura increases to 30 feet.
Aura of Sun's Warmth
At 7th level, you and all friendly creatures within 10 feet of you have resistance to fire and cold damage, and can tolerate temperatures as low as -50 degrees Fahrenheit and as high as 300 degrees Fahrenheit. Additionally, when you deal fire damage, you can choose to deal radiant damage instead, or vice versa.
At 18th level, the range of this aura increases to 30 feet.
Blazing Shield
At 15th level, you are permanently under the effect of the "shield of faith" spell
Zenith
At 20th level, as an action on your turn, you can fill yourself with the sun's brilliant wrath. You may cast the spell sunbeam without using a spell slot. Additionally, at the start of each of your turns during this spell's duration, you regain hit points equal to your Charisma modifier if you have no more than half your hit points left. Once you use this ability, you must take a long rest before you can do so again