13 Worm Agent Make a minomushi, or worm agent (aka insider threat), out of an enemy.

A minomushi is someone who serves the enemy but is made a ninja working for your side. Thus the agent is exactly like a worm in the enemy’s stomach, which eats its belly from the inside out.

—Bansenshūkai, Yo-nin I 1

Never short on evocative imagery, Bansenshūkai describes an open-disguise infiltration technique called “the art of a worm in your stomach” (or “worm agent”), which calls for shinobi to recruit enemy insiders to perform tasks on their behalf. Such recruitment took high emotional intelligence. Shinobi had to choose an appropriate target; engineer opportunities to approach the target; and discreetly parse what the target thought about their employer, ...

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