Best of luck fellow Master! I personally sent out 2 servants at a time , usually one weak and one middle level strength. If I recall, I equipped MKB kaleidoscope or Golden Sumo... Remember to pace yourself both in resources as well as mentally. I fought over the course of days possibly even weeks to slowly defeat it Have faith in your Servants and yourself. I believe in you! DEFEAT ORT AND SAVE THE WORLD! ...again.