The dog-headed servants were slowly accumulated and trained by the Grim Reaper when he was still a God. Initially, the Army would be a big problem for Lu Chen after they gained physical bodies in the sea of life. However-even the aura of the evil did not expect Lu Chen to have an undead divine weapon-Frostmourne.
Although the Army of tens of thousands of specters had a physical body, their cores were Still Undead. This was not a problem at all, but after Lu Chen pulled out Frostmourne, everything changed.
With Frostmourne's ability to control death, Lu Chen detonated the death energy in the dog-headed servants and turned them back into undead. As the death energy was already in the dog-headed servants 'bodies, Lu Chen was only a fuse and didn't consume much energy.
