The notorious Bellatrix Lestrange bore the Dark Mark as a symbol of her allegiance to Lord Voldemort. This mark, magically induced on her inner left forearm, was not just a sign of loyalty, but also a method for Voldemort to summon his Death Eaters, including Bellatrix. When activated, the mark would turn jet black and deliver a burning sensation. Bellatrix was known to cast the Dark Mark into the sky, such as in celebration after Dumbledore's death, where it would form a skull and snake from green smoke, signifying an act of aggression. The Dark Mark was more than just a symbol, it was a threat and a mark of the very worst fear for many in the wizarding world.