1 definition by korik1

Top Definition
This is an unspoken rule in Table top RPGs. It is that the Game Master, or whoever is running the campaign, can simply say no to anything the other players suggest without explanation.
Player: I want to make a half dragon werewolf wielding two greatswords.

GM: I'm invoking Rule 0. No.
by korik1 November 01, 2007

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