The Zoah are the next race you will see after the N'rrgal. They are a race who are bent on conquering the N'rrgal homeland. The leader of this race is called General Raxos. When you reach the point of the Choas Emerald's location, there will be a guard next to a door. Now there are two ways this conversation can go, both of them eventually leading with you having to battle Raxos. Once Raxos is defeated, he will hand over the emerald in exchange for defeating Ix.