The Battest (バッデスト Batesto) is a forbidden item (sword) with contains all the dark magic created from negative emotions of all human beings. According to legend, the dark magic has been sealed away into the book by Jewelina's powerful magic and been locked away, fearing that it's power may cause destruction to both worlds. Rumors believed that the key to the item has been locked away in the forbidden room in the Old Schoolhouse, in which no Jewelpet nor human can enter. Both Yuma and Alma's birthmarks are considered keys on unlocking the key. According to Episode 36, the book resides in one of the orbital rings outside Jewel Land's atmosphere, stating its in space. In Episode 37, the Battest is actually a sword and Alma used the key with Angela's Jewel Charm to unlock the item.

The Battest is sealed again in Episode 38 after the combined magical efforts of Akari, Miria, Sara, Leon, Nicola and their Jewelpets.