Who wins? Are you immune to Mummy Rot? If not.. Do you get the +6 bonus Vs Disease?
Who wins? Are you immune to Mummy Rot? If not.. Do you get the +6 bonus Vs Disease?
Technically, unlike a paladin who by Divine Health gets immunity to mundane and supernatural diseases, an internal alchemist's disease immunity simply states "diseases". Mummy rot is a curse that imparts a supernatural disease.
Were I to judge it, I'd say you'd get the bonus but not the immunity.
If it just gives the blanket immunity "disease", supernatural disease would be a subset of disease. If you're immune to all disease, you're immune to supernatural disease.
The way the FAQ is worded supports this:
Paladin: If I'm immune to disease, am I immune to mummy rot, which is both a curse and a disease?
Yes.
—Sean K Reynolds, 07/25/11