The Dragon Sorcery Wraith is ineffective against the Shadow Legion, also undead, but against those clustered ordinary residents, even well-trained troops, it is a terrifying weapon of slaughter that can create hundreds or even thousands of corpses in minutes.
Moreover, battles are not static. Who knows if the next encounter will be with a lonely figure or with a group of servants guarding? Or perhaps it appears as a unit on the battlefield.
A slight mishap, and it's not them surrounding the opponent, but the other way around.
"Three hundred years ago, we already suffered a loss on this matter. We can't stumble on it again," Regina said confidently. "I can't guarantee the other two grassroots organizations of the Dragon Cult, but as for the Dragon Sorcery Wraith of the Sambia grassroots organization, as soon as they're mobilized, we will receive the news immediately."
The implication was clear — they had infiltrated this cult.