2023 · ソースブック（プレイを拡張するルール／オプション）

The Furnace: A star system with a pure-white sun

This setting guide presents a realistic star system centered on a large, hot F5-type star. It describes how the system appears from an Earth-like planet in the habitable zone, including sky and plant colors, planetary size, space travel, hazards, opportunities, and other celestial phenomena. The guide also provides options for populating the system with different planets, placing it within the galaxy, combining it with other systems, and adapting its details to suit a story. Prompts, general notes, and a glossary support further exploration.

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