How does Griffith's dream have anything to do with becoming a demon lord? Warning: Spoilers Ahead!

I just finished Berserk, and I'm left sitting here in confusion. I tried finding the answers on the wiki and forums, but had no luck. Came here in hopes of finding a Berserk fan online.



Griffith dream was to become a ruler of a kingdom, but at what point did his dream all go to hell? What exactly am I missing in the story that says "My dream is to rule humanity!"?

How did demons originally get involved in all this...?
If you recall in (the original run of) the anime, they call the Behelit the "Egg of the King". There are other Behelits too. In the manga, something similar happens to many other people. Typically, a demon in disguise intervenes when someone is down on their luck and gives them the Behelit. The Behelit warps their fate, giving them everything they wanted. Eventually, fate twists violently and brings them back to despair. When their blood comes in contact with the Behelit (which tends to happen at this low point), the God Hand appears and offers to grant a wish in exchange for a sacrifice. This process turns them into monsters known as Apostles. It's heavily implied that something like this previously happened to the Snake Baron in the first episode of the anime, as well as all the monsters in the last episode. It's been a while since I've read it, so the details may be off a little.

Basically the Behelits are human bait, leading people into situations where they will lust for power enough to embrace being a demon. Griffith's dreams and fate were also manipulated, or at the very least the darkness in his heart was cultivated until he chose the outcome.

The entire anime is just a small part of the entire storyline. It was canceled for obvious reasons.