My speculation on how Berserk will end.
My speculation is based on these comparisons:-
Griffith = Skull Knight/Glaseric
Guts = Void
So, this is how I think it went.
Glaseric sacrificed his friend Void in order to become the fifth member of the Godhand. Void was able to escape the sacrificial altar.
In between, Void would constantly fight against the Apostles in order to get revenge and kill Glaseric.
Glaseric is eventually revived into his physical form, he creates a massive empire.
Void returns and starts an armed insurrection against Glaseric's empire. The insurrection fails and Void is captured and tortured.
Void prays to the other four Godhand members and they come down as the Four Angels and attack Glaseric.
Void sacrifices Glaseric in order to become the first Godhand member of the new generation.
Glaseric kills all the four old generation Godhand members by Using the Berserker armour.
The Four old Godhand members having fulfilled their purpose return to the Idea of Evil.
Void continues to recruit Godhand members to start a new cycle with the end point been Griffith creating his Empire of Falconia.
Glaseric/Skull Knight becomes the avenger with the roles been flipped.
This cycle continues with Guts and Griffith. Right now, Guts is the Avenger, Griffith is the Emperor who will fall. Guts will become the new Godhand, Griffith will kill all the current four Godhand members and will become a ghost of vengeance.
What I am trying to say is this is how the Idea of Evil controls the physical realm. Let a Godhand member create an empire < This leads to a massive war < Let the remaining four Godhand members destroy the empire < With the fall of the empire, more wars break out < Thus, perpetuating the cycle of Evil.
With the theory in mind, this means that Guts will become a Godhand member. However there is a critical plot element that was shown in the first arc. The Baron in the first arc refused to sacrifice his daughter. He went against fate and Guts saw that. If Guts goes against Fate and refuses to sacrifice, then the complex cycle that IOE has designed will fail. With this, Guts has won as the IOE can no longer influence the physical world.
Some other interesting comments:-
-The behelit that Guts has will eventually transform into a crimson behelit .
- The woman that Glaseric holds in his arms is a comparison with Casca. This means that in each cycle, a women is always caught between the two Godhand members.
- Griffith builds his capital city over the ruins of Glaserics's capital city.