All heralds of nurgle were, at one time in their lives, mortals, as all plaguebearers are people who have contracted nurgle's rot. Whilst i would imagine they lost all that remained of their old selves, perhaps especially strong-willed individuals wouldn't.

Quote Originally Posted by Flikre213 View Post
I don't know about a daemonic herald, but there is a fluff piece in the C:SM codex about a warlord who lived in the 20th century and became a daemon prince.

Mortals have the same rights as immortals when it comes to Chaos. They are truly an equal opportunities employer.
I can remember the passage you mentioned there, but i don't recall any mention of the twentieth century. If it did say the twentieth century, and it was a daemon prince of khorne (which, AFAIK, it was), then it would have to have been someone who committed mass acts of slaughter during that time period...

Are GW saying Hitler has ascended to eternal life?