New Rules
Given the collapse of society, the Wealth system from d20 Modern (which is based on a character's credit and standard of living as much as their cash on hand) no longer applies, and in its place the barter system is used. In addition, due to the setting, certain items (such as ammunition) are worth more than they would be in a functioning society, while others (such as electronic entertainment) are worthless. The new barter system prices all items according their relative value in a post-apocalyptic setting, using Trade Units in place of dollars or Wealth DCs.
d20 Apocalypse adds a few other new rules to the game system, including rules for handling vehicle modification and fallout areas, as well as rules for scavenging, post-apocalyptic equipment, and mutations.
Read more about this topic: D20 Apocalypse
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