Episode Title:
Heart of Stone.
Episode Description:
When the Vexicons leave behind Eartha after ditching a battle in the Undercity, the Mysticons take her to the Stronghold as their prisoner, where they see that her core is cracked, which means that she does not have much time, as Proxima had created the Vexicons to be a "sisterhood of evil." Once shattered, Eartha will crumble into nothing. Emerald decides to give Eartha a brand-new heart, full of Mysticon goodness by taking her to the mines of the Jewel of the North, her hometown...
