Child of Atom

The sorcerer's have been given the power of radiation thanks to there's family's devotion and a gift given to them by their God and manifestation of radiation Atom.

how radiation damage works is after taking 100 radiation damage that creature for the next 4 turns roles a Constitution saving throw failed it does not attack for that turn and takes 1d6 of damage at the end of those 4 turns radiation damage is set back to zero and if it the Constitution saving throws succeed they get to attack that turn.

Credit to creators of Fallout

Atom's light

At level 1, Adam has gifted you his light giving you immunity to radiation damage.

Power of Atom

at level 1, Your connection to Adams is strong and you now replace half of the elemental damage of your spells and turn it into radiation damage

Adam's smite

At level 6, Adam has gifted you the ability to add one D6 of radiation damage to your melee attacks. You also gain the ability to replace all added damage from your Smites to radiation damage.

Adams field

At level 6, Adam is now given you the power to once per longe rest create a sphere of radiation in a one d12 times your casting modifier feet for one d10 plus your casting modifier hours. Dealing one d8 plus you're casting modifier in radiation damage per minute they are in the field.

The might of Atom

At level 18, Your connection with Adam has reached its pinnacle and you now have the ability to three times a day max out the amount of radiation damaged creature can take.