Communication between epics did not curb the wars in the material world; instead, it expanded the scale of the wars, with hundreds of worlds burning in the flames of conflict.
In the face of the Heavenly Demon Dragon's rampage, the Sitra Snake-man Empire, though unable to find any specific method to restrain it, had developed coping strategies.
This is a rather simple and brutal method: it's about speed.
The Heavenly Demon Dragon is undetectable during its latent phase, at least through conventional methods.
Once it enters the outbreak phase, it will exhibit extremely obvious symptoms, showing a strong aggressive desire towards its own kind, displaying extremely bloodthirsty behavior, and eventually devouring its own kind.
This mutual consumption process is the best time to intervene. The Snake-man Empire no longer engages in the simple and brutal interventions as it did initially.
