You did a solid work with Mannoroth, and Balnazzar has much more individualism and diversity in his lines, so I guess it wouldn't be a problem. I too tried to find good lines for him.
Ready:
- Come, you burning devils! Balnazzar calls! (Balnazzar30)
What:
- Ready for action. (part of Balnazzar02)
- Heed me, demons! (part of Balnazzar31)
- My power is supreme! (part of Balnazzar28)
Pissed:
- We were charged with overseeing this land. (part of Balnazzar02)
- The Scourge belongs to the Legion! (part of Balnazzar05)
- Ah, my wayward pet. (part of Balnazzar34)
- I see you've grown a spine. (part of Balnazzar34)
- You wouldn't dare! (Balnazzar58)
- I'll cut out your tongue! (Balnazzar35)
Warcry:
- Feel the wrath of the Legion! (part of Balnazzar29)
Yes:
- It is inevitable. (part of Balnazzar52)
- You disappoint me. (part of Balnazzar33)
- This land is ours. (part of Balnazzar05)
Attack:
- You mongrels cannot win! (part of Balnazzar28)
- You will suffer (redacted part of Balnazzar25)
- You will all drown in lakes of blood! (Balnazzar27)