Brotherhood of Unclean Mercy

The Brotherhood of Unclean Mercy are a Chaos Space Marine Warband dedicated to the Plague God Nurgle. Free to act according to their own plans, the members of the Brotherhood of Unclean Mercy were able to seize upon an opportunity of random chance and infect the entire store of supplies in a passing merchant fleet. Thus enhanced, the cargo spread the Stenchgut Plague to an entire continent on Xurunt.

Warband Colours
The Brotherhood of the Unclean Mercy warband's colours are not listed in current Imperial records.

Warband Badge
The Brotherhood of the Unclean Mercy  warband's badge is not listed in current Imperial records.

Source

 * Black Crusade: Tome of Decay (RPG), pg. 17