The Central City

If the demon lord goes to the capital and actually signs the treaty, there was a chance that the demons who aren't in support would rebel. 

Hunn had been trying his best to gain support for the demon lord's cause all this time and he had already gathered a significant number of demon clans that were in support of peace. But they were only about half of the demon race. The other half were not even bothering to listen to Hunn's words! They didn't care about peace, and as far as they were concerned, the demon lord was insane for even suggesting peace.

Hunn spoke up. 

"My lord, perhaps we should try and postpone the meeting with the Angels for a few more days. The demon army is still very volatile right now, and there might be a lot of backlash if we sign the treaty." 

Mark narrowed his eyes in irritation as he heard this before he sighed as he calmed his irritation, Mark knew that there would be those who didn't support this. It was normal.