Thanks to her student, the grass wizard Alena, Gina's excavation of T'uala has located a city-sized myconid pod in the molten rock surrounding the buried fortress, immune to the lava's heat. Within it, thousands of plant-like creatures resembling powerful, armored vehicles have been waiting for an opportunity to return to the world above. Gina's not about to let Alena examine the pod's plant-magic and botanical-tech secrets firsthand, as it's too dangerous. However, with a little help from fluffy-minded relic expert Aljabra, Alena might reach the myconid pod anyway-but will she live to regret meeting the evil of all roots?