After Adel is questioned by Elore by which route he will seek, Adel may choose between 3 routes:

Holy Route, Dark Route or Egg Route.

The last successors of the Altermenos empire are:

Holy Route:Lazareth(Big Sword) and Iris(Epee).

Dark Route:Ivan(Epee) and Olga(Hammer)

Egg Route:Finith(Spears).

In the end, the emperor/empress, fights Vadagara in some way.

Holy:Vadagara himself.

Dark:Corrupted Nemea

Egg:Via The Egg.

Both Holy and Dark successors refer Adel as a father.