Offline Arkz problem

[Orphen]

thats it finished is it not coz once you beat her you start at the begining again or do u need to play it through again?

Well, now you need to do the whole arkz side story. After Castor, you need to fight the final boss, Amplum Umbra. He is somewhat hard, a bit hard for the hunters side too, which is good, since there's an equal advantage, but I dont know, I would say the final boss is definitely easier than castor, who has the potential to put your arkz SC to like, 4 hp in one turn.