Kang Yoon-Soo summoned his undead army. “Summon 76 Rotten Mudgems. Summon 316 Blood Bats.” He pointed toward the flying Bone Dragon and said, “Kill it.”

Shriek!

The Blood Bats let out an ear-splitting shriek before spreading their wings and charging toward the Bone Dragon. They attacked the Bone Dragon and an aerial battle began.

The Bone Dragon was relentlessly attacked by the bats’ sharp fangs, and the Rotten Mudgems gathered mud from the excavation site and flung it toward the Bone Dragon. However, the attacks of the undead were ineffective against the Bone Dragon.

“Kirikiryaaaaah!” The Bone Dragon let out a burst of dark flame from its mouth—it was Black Dragon’s Breath. Black Dragon’s Breath was even stronger than the flames of a fire spirit. The Bone Dragon was a monster that had high resistance against fire, which was why Kang Yoon-Soo had not summoned Sally for the fight.

Multiple Blood Bats were burned to a crisp and fell to the ground. Kang Yoon-Soo waved his hand around as he gave more orders. “Rotten Mudgems, throw the corpses of the Blood Bats into the sky.”

The Rotten Mudgems picked up the corpses of the Blood Bats that had been killed by the Bone Dragon, and flung them toward the dragon.

Kang...