Radiation Armor is a Primary Power Set for Tankers, and a Secondary Power Set for Brutes, Scrappers, and Stalkers.
Radiation emanates from your body which harms your foe but empowers and shields yourself.
At 1st level, you can protect yourself with a field of intense radiation. You can activate this feature without costing an Action but you must do so on your turn. It will remain active until you deactivate it on your turn, or become unconscious or incapacitated. You gain resistance to bludgeoning, slashing, piercing, and poison damage. You must set aside one Endurance Die while Alpha Barrier is functioning.
You can use Proton Armor at 1st level if you are a Tanker, Brute, or Scrapper, and at 4th level if you are a Stalker. You can use Fallout Shelter at 2nd level if you're a Tanker, at 4th level if you're a Brute or a Scrapper, and at 6th level if you're a Stalker. You can use Beta Decay at 4th level if you are a Tanker and at 8th level if you are a Brute or a Scrapper. Each of these features requires you to set aside an additional Endurance Die.
At 1st level, whenever you receive damage while you are at less than one half of your maximum hit points, or reduces you to that amount, you may use your Reaction to restore one Endurance Die or roll one Endurance Die and heal yourself by an amount of hit points equal to the result.
At 3rd level if you are a Tanker, 6th level if you are a Brute or a Scrapper, and 8th level if you are a Stalker, you can release a burst of radiation out from your body. Each creature within 20 feet must make a successful Saving Throw or suffer 2d6 radiant damage and become vulnerable to poison damage until the end of its next turn. You gain 1d4 temporary hit points for each creature affected. A creature that makes a successful Saving Throw takes half radiant damage but does not become vulnerable to poison damage or contribute to your temporary hit points.
You can use Ground Zero at 10th level if you are a Tanker and at 14th level if you're a Brute, Scrapper, or Stalker.
At 7th level as a Tanker and at 11th level as a Brute, Scrapper, or Stalker, you can use your Reaction to absorb all of the damage from a single attack roll made against you. Whenever you do so and you are at less than full health, you can restore one Endurance Die.
At 12th level as a Tanker and at 15th level as a Brute, Scrapper, or Stalker, you can use your Bonus Action to roll one or more Endurance Dice. You add the result of this roll to every damage roll you make until the beginning of your next turn. If you use this feature while you have more than one half of your maximum hit points, you also gain resistance to all forms of damage for the same duration. Once you use this feature, at the end of the first turn that you do not use it, you will lose one half of your remaining Endurance Dice (round up).