Sickly One

The Sickly One, also known as Cultro, was a member of the Legion of Exile from early on. He was originally a friend of Lord Tachanka, but as Cultro fell more to the dark side, Tachanka distanced himself from him. The Sickly One gets his name for single-handedly destroying the Legion of Exile, as he and everyone in it were killed by a disease that he unknowingly brought.

Not only did this plague kill himself, but it also destroyed the Knight, and his cult. Tachanka got lucky, as he had left the Legion following the Double Coup, but his luck would eventually expire.