The d20 System is a frameworking of rules and options that can be used to play a role-playing game with. Owned by Wizards of the Coast, the system is most famously used for Dungeons & Dragons, though modified versions are used for numerous other games.
Through proper licensing, companies other than Wizards may be allowed to create content to use with the d20 System as well. Pathfinder is an example of this.
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