Board Thread:Questions and Answers/@comment-116.88.10.75-20160322122421/@comment-26484417-20160413030525

I don't mean to burst anyone's bubble, but it's entirely possible that Wangnan's entire role in the plot was a red-herring. He could be extremely important to the plot just as easily as he could be nothing but an incarnation of SIU's trolling tendency. =P

Assuming the former, one theory presented itself to me sometime ago. The theory is mainly based on two bits of information:   key information is that Zahard is unkillable* for anyone but those who aren't bound by the laws of the Tower (i.e., Irregulars).  key information, though a mere speculation at this time, is that Wangnan is related to Zahard; possibly on a biological level.  Now, Wangnan is anything but extraordinary when it comes to the characteristics that usually identify someone who bears the Zahard's name, BUT what if he inherited—or otherwise gained—something much more subtle instead? For instance, what if Wangnan—like Zahard himsefl—is unkillable by Regular means? Even if Wangnan's condition isn't as potent as Zahard's, it could still explain how he managed to survive a fatal wound from Beta, and why—also assuming this is the case—his soul couldn't be consumed, or at least couldn't be digested, by Hoaqin.

*: The term 'immortality' is misused in the context of the ToG, or—more precisely—it's almost exclusively used to indicate an infinite lifespan.