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Grenn injured his wing. Lorana was able to fix it, despite it being an injury that usually caused a fire lizard to go between.
When Lorana and Colfet escaped the Wind Rider, Grenn and Garth, Lorana's other fire lizard, accompanied them. Both fire lizards were sick from the dragon plague. When a terrible storm hit, Lorana tried to save her fire lizards by sending them away from her. They both ended up at the College at the end of the First Pass. Garth died, but Grenn recovered when Wind Blossom and Tieran took care of him. Grenn stayed with Tieran.