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Kiseki Wiki

Master quartz (マスタークオーツ, masutaa kuootsu) are a new type of quartz introduced in Trails to Azure. At the time of its introduction, the master quartz contrasted with normal, rectangular quartz in its larger size and round shape. Each of the seven elements had three different master quartz available. Master quartz are equipped in the center of the combat orbment.

What makes the master quartz unique is that, unlike normal quartz, they level alongside its user. The higher its level, the more of its elements' orbal arts the user is able to use. Reaching the highest unlocks master arts (マスター・アーツ, masutaa aatsu). These particular features make the master quartz so rare that they are not mass-produced and only one of each can be obtained in the games.