>Question: While elemental damage does not carry-over to
>serpent strike damage (i.e. serpent strike does not
>incorporate flaming bite, drowning, etc), does metal vuln? If
>I'm wielding an iron sword, will I be doing iron vuln damage
>to an elf with serpent strike?

Quick glance through the code (and not actually testing it), I suspect that serpent strike with an iron weapon would hit the iron vuln of an elf. The material vulns are treated a bit differently than elemental vulns, and in this case should hit.