After the attack, Murkel started to make some changes in his dimension. At first, he took the bodies of the dead and began to open them up. With his red crystallized body parts, it was easy to slice and dice the mages.
In doing so, he didn't find out much, apart from them looking to be the same as regular citizens on Pagna. Their bodies had the same type of organs. The only thing that looked slightly different was the heart.
All of them appeared to be slightly darkened compared to a real heart, which Murkel had seen before.
At the end of the day, Murkel was no physician, and there were no real tools at his disposal, so the only conclusion he could come to was that these mages were the same as humans visually.