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| Publisher |
BOOM! |
| Writer |
Shane Michael Vidaurri |
| Cover Artist |
Marguerite Sauvage |
| Published | September 2018 |
As Steven continues to hold onto the Harmony Core, it's up to Amethyst to take over his responsibilities, including band practice. But when more Harmony Cores threaten to activate, the Gems must act quickly or else the entire Earth will be put in danger!
