The Best Gift
Tang Shaoyang did not plan to give Dinael that much time to make the decision at first. But after hearing what she had to say, he decided to give her more time to think. She was inclined to take his side, so he did not mind waiting a bit longer.
The plan was to take down the factions in the Nirvana Alliance one by one. Before their punishment expired, they could not work together. That was his chance, and he planned it in five or maybe six years.
Five or six years would be enough for him to get even stronger, adding more Archaic Spirits and upgrading them all at least to Intermediate or Advance Archaic Spirits. That was the general plan, and he would start it from their weakest faction, The Divine Church. That was why he needed Dinael in his plan.