Thirst for Vengeance.

The shout of rage rang out and reverberated loudly but the sound waves didn't escape the confines of the floor. The floor from which the shout originated was within the lower half of the castle. It belonged to an origin god who was the father of the novice origin god. 

This origin god is called Stonehage. He had only been able to sire just two children throughout the long length of his life. The fact that high-level lifeforms have difficulty having offspring coupled with his race's low fertility made propagating his bloodline very difficult. His two kids were his pride and joy. 

One of them became an origin god recently and the other just became a sovereign. He had been lucky to have them when he was younger and his wife was still alive. His wife died in the tower of heaven, so he was left with his two kids.