Just to suggest that there were some great minds existing around (prior to) the time of the construction of Dendera, Archimedes being the first to spring to mind. This was a time of science and tech advancement, with death rays, lens polishing and astronomical discoveries. We have the Antikythera mechanism dating roughly from this period, the Colossus of Rhodes and legends of automata..
Perhaps the mythological explanation could mask a scientific experiment, explained in terms the masses might understand..
"Death Rays"? a phalanx of polished shield to blind an enemy, not exactly "Death Rays". the Colossus of Rhodes was a stone statue, Archimedes was long dead when the Antikythera machanism was devised ( about 200 years) . I do not doubt for one second that the builder of the mechanism was less than a genius,Archimedes was certainly not associated with Dendera in Egypt, that centre was way before his time.
Whilst I am sure that many scientifics advancements were lost to mankind when the Library at Alexandria was sacked and burned, most of the manuscipts had already been copied by the Moors and are in Spain