Sitatapatra, the White Parasol deity, is the female, wrathful embodiment of Avalokitesvara (Chenrezig). She is commonly depicted as having 1,000 arms, 1,000 legs, and 1,000 faces. She also has 10 million eyes on her body.
Sitatapatra emerged from the Buddha's crown while he was in Trayastrimsa heaven. He announced her purpose as to "cut asunder completely all malignant demons, to cut asunder all the spells of others... to turn aside all enemies and dangers and hatred." Her practice is particularly helpful for black magic and evil spells. It is also helpful if you've been wrongly accused.
Sitatapatra looks benign and peaceful, but actually she is a destroyer of malignant demons. She is also not a bodhisattva, but a fully enlightened Buddha.
She has methods for accomplishing her objectives. Remember that Avalokitesvara is the Buddha of infinite kindness. Therefore, there ought to be no wrathful method of killing malignant demons according to her methods which does not require infinite kindness. How can this be the case?
Well, there are a few methods. Firstly, and most importantly, there may be people who simply want to kill you by spreading rumors about you which happen to be true, but hiding the fact that the things which happen to be true are acts of kindness to others. These people may not understand them to be acts of kindness, because they have malignant projections regarding what counts as an act of kindness. However, it's always the case that a demon wants kindness. (Even demons wish for enlightenment.)
The issue at play in these situations is that the demons are unaware of means by which they can be kind to themselves. Their negative projections are so fierce, they want to kill people just because they're "shocked" at any possibility that you could be right. So, Avalokitesvara could, for instance, take these demons on a very long tour of all the things you got right, over and over again, until the demon becomes thoroughly convinced that the wish to kill "you" is an act of kindness. Then, Avalokitesvara could take the demon on another long, long tour of all these acts again, until she convinces the demon that this so-called "you" it had in mind actually was a reflection of itself. Finally, the demon, thoroughly convinced that it wants to die as an act of kindness to itself, requests Avolokitesvara for means to death. Avalokitesvara then kills the demon.
Sourced from Wikipedia, Tsem Tulku Rinpoche's blog, and the Tibetan Mongolian Museum Society.