Directly from Terminus Est: Typhus !

I present to you the Space Marine named Calas Typhon of the world Barbarus, the Herald of Nurgle and the host of the terrible plague known as the Destroyer Hive. 

A Champion of Chaos and the former First Captain of the Death Guard Traitor Legion. The most feared of all Chaos Lords to commander of the legendary Plague Fleets. He rules the Death Guard's armada from the bridge of his flagship, the Terminus Est!

Ladies and gentlemen, i give you

"I shall reap a terrible bounty from the death that I sow in your name, Father Nurgle..."

-Typhus the Traveler, Herald of Nurgle