Cursemites are fleas that have been mutated by the Nurgle Gellerpox plague, which has greatly increased these insectoid horrors' size and aggressiveness. They are known to fight beside any creature that has also been infected by the Gellerpox plague.
Once miniscule fleas, Cursemites are created after feeding upon Warp energy. Still drawn to blood, they are able to spring forwards with shocking speed. Once their mouths find an artery, Cursemites can drain a man-sized host of blood in seconds. As they feast, the parasite will balloon and swell as well as turn crimson. Only after draining every ounce of blood will they move on.