Mortarion

Mortarion is Primarch of the Death Guard. He grew up on Barbarus and his main characteristic is a high resistence to all sorts of poisons and disease. He appears in the following continuities:
 * Lovehammer, where Mortarion adopts Saturn and remains a loyalist
 * Heresy & Rebirth, where he dies as a loyalist and is reborn thanks to Serenity's spell
 * Karmaverse, where he also dies and is reborn as Kali thanks to Serenity's spell
 * Scattering of Serenity, where Mortarion turned to Horus and was later slain by the Deciever
 * Toy Soldiers, where he makes a few brief cameos