House Copperdark of the Deleasean Plateau is undoubtedly the most technology advanced of all the houses- and this can be attributed to two specific individuals, a pair of twins, one named Stradavocus, and the other Keslemere.
While technological ability is comparatively limited within Deleasean's universe, due to distinction of natural laws that sets it apart form ours, the brilliance of the twins was such that they discovered ways by which the limits could be pushed.
Stradavocus combined sorcery and science together, seeking to create intricate masterpieces of unequaled ability. From her came miraculous devices, clockwork wonders and 'davocs', robotic creations which served the elite of Copperdark as servants, guards, or amusements.
Keslemere had no patience or want to put vast sums of effort into but one creation as her sister did, and instead poured her efforts into works of broader impact, connecting the Acropolis and its outlying territories with railroads, refining factory processes, and pioneering automobiles.
Though the twins have vanished under mysterious circumstances, their work went on to be elaborated by apprentices, students, and possessors of their prized notes, most notably one student of Keslemere's who designed the aircraft that have since made Copperdark the power they are.