3e SRD:Innuendo Skill
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Innuendo (Wis; Trained Only)
The character can get a message across to another character with the Innuendo skill.
The DC for a basic message is 10. The DC is 15 or 20 for complex messages, especially those that rely on getting across new information. Also, the character can try to discern the hidden message in a conversation between two other characters who are using this skill. The DC is the skill check of the character using Innuendo, and for each piece of information that the eavesdropper is missing, that character suffers a –2 penalty on the check. For example, if a character eavesdrops on people planning to assassinate a visiting diplomat, the eavesdropper suffers a –2 penalty if he doesn't know about the diplomat. Whether trying to send or intercept a message, a failure by 5 or more points means that some false information has been implied or inferred.
The DM makes the character's Innuendo check secretly so that the character doesn't necessarily know whether the character was successful.
Generally, retries are allowed when trying to send a message, but not when receiving or intercepting one. Each retry carries the chance of miscommunication.
If the character has 5 or more ranks in Bluff, the character gets a +2 synergy bonus on the check to transmit (but not receive) a message. If the character has 5 or more ranks in Sense Motive, the character gets a +2 synergy bonus on the check to receive or intercept (but not transmit) a message.