1997 · ソースブック（プレイを拡張するルール／オプション）
Underworld Sourcebook
A sourcebook detailing the four major international criminal syndicates—the Mafia, Yakuza, Triads, and Seoulpa Rings—along with gangs, terrorists, assassins, and other organizations operating outside the law. It covers their markets, practices, traditions, histories, and secret rituals, with guidance for building organized-crime campaigns and adapting them to local settings. The book includes alternate rules for playing syndicate members, as well as adventure hooks, story starters, background information, and campaign material for Shadowrun.
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スキルベース（スキルを購入または獲得）ポイント制（ポイントを割り振ってスキルや能力を得る）ダイス（主にd6）
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