When Gnomeregan was invaded by a horde of Troggs, a radiation bomb suddenly exploded throughout the city, many gnomes still within the halls became horribly mutated and insane, changing into what are now known as Leper Gnomes. While the radiation was being cleansed and the lower levels of Gnomeregan being retaken by the Gnomes under the leadership of High Tinker Gelbin Mekkatorque, thousands of Leper Gnomes were captured, imprisoned, and successfully cured by Gnome Doctors while the rest under the command of Sicco Thermaplugg were able to flee the city through a secret passage and seal it to prevent Gelbin and his people from following. Taken refuge in Gillijim's Isle and settling with the Jungle trolls of the Razzashi tribe, Sicco Thermaplugg leads the Leper Gnomes to join the honorable Horde.
Creation Screen Description
"Seeking to change themselves, these outcasts..."