Phantom Death

One of the other things I don’t like about the Iron God Adventure Path is the extensive use of scientific terms.  I do my best to avoid this and rename things more appropriately   Nimmerians don’t use the word radiation, for example, as this is a scientific term.  Though the locals are well aware of its lethality and refer to the effects as the Phantom Death.  For convenience, I usually just call it what it is – radiation poisoning – around the gaming table.  
Credit to Fallout for the name and the WoTC DM forum members who gave me the idea to use exhaustion (5e) as a mechanic to replace ability drain (3.5e). 
23022019: After playing with this mechanic for 4 years I ended up making radiation a special poison damage type. See below. I didn’t want high-level characters who are pretty much immune to poison by the mid-teens to no be threatened by radiation as its intrinsic to my campaign setting. But I also didn’t want to take away anything earned by the PCs like heroes feast. Compromise below.

RADIATION

Radiation can be naturally or artificially produced. All stars produce radiation in some variety, and planets closer to these stars typically suffer more severe effects than worlds farther away. Many starships and other pieces of technology incorporate radioactive parts and fuel cells that can flood an area with harmful radiation when ruptured or exposed. Ancient alien civilizations might leave behind powerful artifacts that emit harmful radiation. Whether the source of the radiation is natural or artificial, any character in an environment rich with radiation may suffer some negative effects for exposure.
Radiation is a cScreen Shot 2015-02-26 at 23.08.04ontact poison effect the severity of the exposure determines the lethality of the dose (and the DC).  Creatures that are exposed to radiation must make a Constitution saving throw each round or suffer levels of exhaustion, as set out in the Radiation Damage table.
Radiation is poison damage and any ability or spell that affects poison will, likewise, affect radiation damage.  Creatures that are immune to poison damage take no damage from radiation, and creatures resistant to poison damage reduce the strength of the effect by one step. For example, one level of exhaustion would become poison status effect.

RADIATION DAMAGE

Radiation is a new damage type which is a powerful form of poison damage. When a creature does radiation damage treat it as poison damage with the following additions:

  • If a save triggered by the radiation attack the creature also gains 1 level of exhaustion when it takes damage from the attack.
  • If a creature is hit by the attack – even if no damage is taken – the attack strips away poison resistance by one step for the rest of the encounter. This will eventually make the target vulnerable to poison damage. This occurs before applying damage. For example, a green dragon which is immune to poison damage hit by radiation would have its immunity reduced to resistance. If it is hit again by a radiation attack the green dragon would lose its resistance to poison. Another hit from radiation damage would make it vulnerable to poison damage.
  • A creature that rolls a natural 1 on a saving throw triggered by a radiation attack is mutated.
  • A creature reduced to 0 hit points is dead and turns to ash and all that is left is a morbid shadow burned into the floor where it died.
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