The origins of Grundy's resurrection come from the fact that the Parliament of Trees, a high council of Plant Elementals, tried to turn him into the newest Plant Elemental. However, the process was missing one vital piece: fire, as a Plant Elemental cannot be fully created unless it died in flames. Since Grundy's death did not involve fire at all, the process is not complete, and he becomes a sort of half-functional Plant Elemental.