Back Slot Revision: August 4, 2026
Jewel Stones for the back slots (Wings) can be bought from the Item Shop, where they are available in exchange for Diamonds.
| Type | Jewel | Highest Power Level |
|---|---|---|
| Normal |  [Nebula Jewel] |
+6 |
 [Advanced Nebula Jewel] |
+12 | |
 [Master's Nebula Jewel] |
+20 |
| Type | Jewel | Highest Power Level |
|---|---|---|
| Perfect |  [Perfect Nebula Jewel] |
+6 |
 [Perfect Advanced Nebula Jewel] |
+12 | |
 [Perfect Master's Nebula Jewel] |
+20 |