: The word "Omnibus" (the origin of "bus") was coined as a pun by Monsieur Omnès in 1827 to indicate both that the vehicle was "for all" and to highlight the name of the service's instigator, Omnès himself. Parents guide - Wise Man's Grandchild - IMDb
The episode marks a shift from the protagonist's school life to a broader political and magical investigation: 4 : The Name of the Instigator
: The King orders a joint investigation into the appearance of a new "demonoid," escalating the series' tension and introducing more serious world-building elements. : The word "Omnibus" (the origin of "bus")
In different fields, "the name of the instigator" appears as a specific functional feature: 4 : The Name of the Instigator