An All-Ninja Party (CNH)

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Things are easier when the ninja character is accompanied by ninja from his own clan. There is no danger of trouble resulting from the sudden discovery by another party member that one character is a ninja.
When a party of ninja is traveling out in the wider world, it is a good idea for them to maintain their cover identities at all times. They should not utilize ninja hand-signs in casual conversation or discuss mission parameters unnecessarily. Ninja know that their enemies sometimes employ wizards (who could have wizard eyes floating through the room), and often employ ninja of their own (one could be hanging from the rafters even now, listening to every word).