Kaodi
Legend
Mr. Burlew has confirmed that that was an inflict wounds spell; Durkon never prepared cure spells (because why would he?). When he tried to spontaneously cast one on Roy, it turned into an inflict spell, instead.
Alignment is one of those topics that pops up often over there, but no one ever convinces anybody of anything.
I personally believe that Durkon has exhibited evil (or at least dishonorable) behavior in this strip (I don't think the old, Lawful Good Durkon would ever have coup-de-gras-ed a a foe.) I further don't believe that Thor would grant spells to a vampire. Hel might, but, because of the wording of previous prophecy, I think it is much more likely that Durkon serves Nergal, now (whether he knows it or not).
No where in the rules does it say that becoming a vampire causes you do worship and draw power from the closest thing there is to a god of death. And especially I have never seen a rule for "your patron deity changes and you do not know it" .
SRD said:An evil cleric (or a neutral cleric of an evil deity), can’t convert prepared spells to cure spells but can convert them to inflict spells (an inflict spell is one with "inflict" in its name).
As long as Durkon is evil he must cast inflict spells spontaneously regardless of who he follows. Thor may not give a damn about Durkon's alignment as long as he is serving the Order's cause. And I am not sure the fact that Durkon was forcibly turned into a vampire would be all that compelling a reason to stop granting Durkon power as long as Durkon did not do anything really offencive.