After they were made to believe Sol was the original hybrid's reincarnation, they became more inclined to believe everything he said. Leaving them with the little information, he also requested the Dreamwalker's body be sent over to Lord Aldryn due to the promise he made to the man, and the young prince was more than willing to oblige.
By evening, Prince Dalton was done with every important task he had in Somnalis and quickly left, leaving behind soldiers since the entire city guard was closed down and the entire population of the town was under house arrest.
Charging an entire town for treason and killing all its adult population was not something realistic. They would be creating hundreds or even thousands of orphans. However, major figures involved in the plan, like Lord Aldryn's wife, son, and other core members, were taken to the capital.