Board Thread:Warhammer 40k General Discussion/@comment-25618639-20141119150740/@comment-28917471-20150102212236

Well... if you rely on the articles info, then here is the quote from the Vulkan article

Vulkan had been revealed to be a "Perpetual", a being who was capable of continuous cellular regeneration and therefore was effectively immortal, much like their father, the Emperor of Mankind.