Raphael's Plan
Raphael considered the option of simply eradicating all of the messengers in one blow. That was the easiest way for him to get rid of all the letters that included Rowena's portraits and it would keep her safe.
King Draco would come to realize that someone was against his wishes and might stop finding Rowena if he realized that he incited the wrath of a god.
However, not only did Raphael not wish to spill the blood of innocent people who were only ordered by King Draco… something like that would be heard of by his father.
The King of Cretea was going to be furious if he heard of what Raphael did for one human.
That was why Raphael was going to deal with it in a less obvious manner. It was a task that even one god alone would have difficulty accomplishing.
However, not only did Raphael succeed with his task which proved his diligence, but it was also because he was the Seventh Prince of Cretea that had the help of his friends.