The Grey Wizard of Hogwarts

The pattern of the Dark Mark is a skeleton spitting out a snake.

Voldemort once made one for Lupin's arm, which was later guarded by Dumbledore's phoenix. Anton had planned to wash off this mark, but Lupin refused.

Needless to say, it must have been Dumbledore's old bee's idea again.

The Dark Mark should belong to the communication magic in war magic. Similar magic spells played a great role in the war with goblins.

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