As you can imagine, their physical bodies are incredibly powerful.
And after transforming into a spectral state, the strength of their flesh and blood is preserved, while also gaining some characteristics of the undead.
That is, they have no fatal weaknesses!
Even if you twist off their heads, they can still pick them up and put them back on their necks as if nothing happened.
The only way to kill these creatures is to exhaust them, to deplete their health bars completely!
Zi Liyuan has no interest in killing this creature but instead wants to subdue it, imprint it with his own Spirit Brand, enslave it, and make it a part of his Undead Army.
To put it bluntly, there isn't a single being in Zi Liyuan's current Undead Army whose combat power exceeds that of this Spectre Behemoth King.
However, Xiao Guang can definitely beat this creature, as it is a mechanical airship life form with unparalleled speed in its class and a ridiculously large attack range.