Mo Fei nodded, "I accept your vow, but I hope such a day will never come."
He reached out his hand, and the two grasped each other's hands firmly.
"What are your plans next?"
"I will first take back Naxxramas, then subjugate the scattered Death Lords one by one. Without a master to control them, these Death Lords would certainly endanger the world. As the Lich King, it is my responsibility to restrain them.
As for what comes after— I will go to the Dark Portal to attack the Horde; I still have scores to settle with them."
This was also one of the conditions Varian had previously negotiated with the Alliance leadership.