#sorcerer class

Radiant

Your exposure to radiation has caused you to build up a small resilience to it, when you take radiation damage you gain an amount of temporary hit points equal to the amount of hit points irradiated. You also become immune to disease.

Toxic Spellcasting

At 6th level, when you cast a spell or cantrip that deals damage, you may spend 1 sorcery point to change the damage type to radiation, you also now resist radiation damage.

Adaptive Metabolism

When you reach 14th level, your body has mutated to easily accommodate deadly substances. When you would normally take poison damage from ingesting poisonous substances or poisoned ammunition, you instead regain hit points equal to half the poison damage caused, if you would normally receive the poisoned condition you can instead remove one condition currently affecting you.

Radioactive Reap