A Toast to the Lost

"What about fuel? What does it run on?" Callum asked.

"It uses military-grade metal hydride fuel plates in a sealed design. In theory, the white-flame furnace itself can be reused, but the fuel plates are produced by military factories. We can't make them ourselves. Once the fuel runs out, the furnace becomes useless. With so many people, we only have a limited supply, so we conserve whenever we c