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Despite being one of the most well-known rituals, all but a small part of the ritual has faded from public consciousness. Reason for this is currently unknown, but theories suggest conspiracy from either the government, or some other powerful occult organisation.
Until more information is uncovered, this document is classified.
Queen Mary I of England was in rule from 1553 to 1558. During her short rein, she led a particularly brutal persecution of protestants. This persecution was so bad, it not only granted her the title of 'Bloody Mary', but also a special place in hell.
Hell is a large place, and with the constant supply of souls, it can be challenging to deliver the appropriate amount of torment to all of them. To combat this, the most vile souls, those especially talented in torture, are ascended to pseudo-demonhood, taking the position of tormentors.
Legends speak of ritual, which allows one to speak to Mary. Being a pseudo-demon, she possesses immense occult knowledge and, given her position, she can interrogate the dead for information.
At first, one must show their dedication. Each night, for 333 days, one must enter a dark room, light a candle, stand in front of a mirror and say "Bloody Mary" three times.
On the 333th night, one is to recite the following text instead:
Bloody Mary, I invite you into my house Bloody Mary, I invite you into my soul Bloody Mary, I inquire your wisdom Bloody Mary, Bloody Mary, Bloody Mary
After that, they should light a fire and burn a piece of fresh meat in it.
From then on, the regular ritual should make the mirror reflection be replaced by image of Mary. She is not obligated to answer your questions, nor to tell the truth, but she usually does. Sometimes, she requires another sacrifice. Sometimes when she interrogates the dead, she makes you watch.
There is one more catch to the rite, however. At the end of the 333th night, the Devil transfers his rights to the participants soul straight to Mary. This is, naturally, only of use if their soul goes to hell, so she tries her best to lead participants to the path of sin.
Further research is required.