This is going all according to the plans made by Griffith till now, the prophecies just made people slave to his decisions without any need of force or any other scheme, this creature who is getting compared to Shiva is just walking down the path made for him by these people.
Even though Ganishka has been such a consistent evil bastard... Dunno, this is almost heartbreaking to see, him losing his mind and being barely able to comprehend anything anymore.
Coupled with his backstory, it kind of makes me sad about him.