Following an evil use of dark magic, what spell do the Death Eaters use to send a 'Dark Mark' into the sky?

The Dark Mark is the symbol of Lord Voldemort and his Death Eaters and is depicted by a serpent slithering through a skull's mouth. This represents a Slytherin's ability to speak Parseltongue (the language of snakes), and when cast into the sky, it's chillingly large and glowing green.

Asked by Rachel Bortles · Last updated 5 years ago · 7.5K views · SOURCE