Despite having captured Phos, the Lunarians demand more Lustrous from Ventricosus, but Aculeatus manages to break free and beat the Lunarians. Aculeatus proposes that they use Phos for negotiations with the Lunarians, but Ventricosus convinces him to return Phos to the others. With their legs lost in the battle, along with some of their memories, Phos receives new legs made from agate shards that Ventricosus left with them. Despite losing their job writing the encyclopedia, Phos discovers that their new legs allow them to run at high speeds.