The Castle Guide
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RPGs have variable players and duration.
Of Ships and the Sea
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"Of Ships and the Sea" for AD&D provides comprehensive rules for ships, sailing to exotic lands, and two naval combat systems. It also explores underwater adventuring with rules for travel, combat, spells, magic items, and a new character kit for deep-sea exploration.
RPGs have variable players and duration.
Creative Campaigning
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RPGs have variable players and duration.
Monster Mythology
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RPGs have variable players and duration.
The Complete Book of Necromancers
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RPGs have variable players and duration.
The Complete Book of Villains
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RPGs have variable players and duration.
Arms and Equipment Guide
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RPGs have variable players and duration.
Sages & Specialists
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RPGs have variable players and duration.
Campaign Sourcebook and Catacomb Guide
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RPGs have variable players and duration.