The earth dragon clan had managed to finally crack open the defenses of the elves, resulting in the elves suffering the first real lose.
And not only that, but their information network took an massive hit after losing both an outpost and chunk of their territory.
And if we add the fact that the people are scary and wary of both the "mysteries assassin" as well as the plague alongside the story of "the food supplies had been infected", the information network is pretty much in shambles, since they have too many things to do, with ended up giving the earth dragon clan an chance to push further in and start slowly gaining more and more ground.
But here is the thing.
"We lied."
The plague isn't ravaging the entire kingdom.
There isn't many assassins.
And not all of the food supplies in the kingdom had been infected.
Lets talk in the details what was the Thanatos doing.
I've gave her three missions.
1 – Make it noticeable that the food had been infected.