Grim Reaper

The ground started to tremble.

Loud scratching noises filled the air as thousands of eyes appeared in the murky darkness.

"Here they come!" Van shouted.

Immediately the battalions around him rearranged themselves so that Van's battalion was the tip of a spearpoint, with Van acting as the penetration point. This was the formation that they had trialed to success in the first round. 

Giant rats suddenly leaped from the darkness.

 Like a tsunami, they poured into the light-filled space. The rats were black and hairy; their incisors long and sharp. The rat horde consisted of rats in the 1st and 2nd rank. They had fewer numbers that the demonic bats but made up for it with their intelligence and sheer ferocity.