The western horizon.
A lightning bolt appeared immediately.
It illuminated the boundary line of the dark heavens and earth, flickering intermittently.
Soon after.
The far eastern direction seemed to sense it too, as another lightning bolt struck.
Following that.
Thunderbolts appeared in all four dimensions of heaven and earth.
No rumbling sounds could be heard.
This indicated an extreme distance.
Yet, the flashes of lightning continued, steadily drawing nearer.
This undoubtedly showed that the Iron Hammer had successfully attracted the Tribulation Thunder.
Demon Moon's expression changed repeatedly.
Her Dead Corpse Army feared Heavenly Thunder above all else.
During thunderstorm weather, dead energy became the easiest target for Heavenly Thunder's assault.
If that were coupled with disciples of the True Thunder Sect wielding Thunder Path Techniques to direct the strikes, they could hit with incredible precision.
Not to mention the Dead Corpse Army.