The boss, from screens and movies I've seen, seems to be well done.  Does a cliché plot matter if you have interesting twists?  No.  Besides, temple of the Gods seems to suggests idols and statues and ancient alters, and this boss seems to reflect that. . . it can bother you if you want it to, but it's fine with me.  But perhaps it is a cliché. . . I mainly only play Nintendo games.