2015 · ソースブック（プレイを拡張するルール／オプション）
How Do You DO That? (M20)
This rules-focused sourcebook for Mage: The Ascension provides practical guidance for using the Sphere magick system. It presents detailed mechanics for a wide range of feats, including transformation, elemental control, energy work, enhanced perceptions, martial arts, mystic travel, necromancy, summoning, time manipulation, and uncanny influence. Rather than offering fixed spells or rotes, it explains the rolls, Traits, consequences, and other systems involved in common and elaborate magical effects. The material is organized into ten categories and is designed to support imaginative player-created acts of magick without adding setting or character information.
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成長ツリー（スキル、職業、魔法能力など）ダイス（主にd10）属性／ステータス制（STR、CON、PERなど）
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