The Heart of the Mountain represented a crystalline relic. This relic was intrinsically tied to a war machine, specifically a walker, situated on the planet Skara Nal. It was placed into a designated socket within the walker's control room, serving the purpose of maintaining the vehicle's dormant state while it remained concealed within a mountain. The Heart of the Mountain, as portrayed in pirate folklore concerning Skara Nal, was rumored to possess significant power and substantial worth. During the period spanning 19 BBY to 18 BBY, Phee Genoa sought to seize the Heart of the Mountain when she discovered the walker in conjunction with the Bad Batch. However, the [superweapon]'s](/article/superweapon) subsequent activation following the crystal's extraction, coupled with its destructive outburst, jeopardized the group's chances of escaping, particularly if their ship suffered destruction. Consequently, Genoa was convinced to reinstate the crystal, which successfully deactivated and obliterated the walker, albeit at the cost of the Heart's destruction via melting.