It soon turned bright red and then, with a loud BOOM, it exploded outwards. Keith snapped his fingers, sending all his death knights into his spatial dimension along while he too vanished, escaping the explosion.
Almost every spider was burned to smithereens. While they were undeads, their legs were still extremely susceptible to fire. Those that lived, were unable to walk anymore.
Most Zombies turned into ash but those that lived, were mostly burnt to extreme levels. They could still walk, with burnt flesh falling off their bodies but their numbers had dwindled by a lot.
It was the same with the other undeads except the Death Knights. The ones that were in the center, had their armors bright red due to the heat but they still stood straight and moved like they normally did.
Keith came back out from his spatial dimension along with his army of Death Knights, but the moment he did, he heard his own voice, which was slightly guttural and sounded growly.