The Seventh and Last Pentacle of Mars
Write thou this upon virgin parchment or paper with the blood of a bat, in the day and hour of Mars; and uncover it within the Circle, invoking the Demons whose Names are therein written; and thou shalt immediately see hail and tempest.
The Key of Solomon is the best known of the Renaissance grimoires, surviving in dozens of manuscripts in Latin, French, Italian and Hebrew. Mathers made his 1889 edition from seven manuscripts in the British Museum, and it is his plates that every later reproduction of these pentacles descends from.
The Key of Solomon the King (Clavicula Salomonis), translated and edited by S. Liddell MacGregor Mathers (London: George Redway, 1889). The text and the pentacles are in the public domain.
The pentacle is traced from the plate in the De Laurence edition of 1914 (Chicago: De Laurence, Scott & Co.), which reprints Mathers' plates at a larger size, and checked line for line against the 1889 printing.
Mathers' note: In the centre of the Pentacle are the Divine Names, El and Yiai, which have the same numerical value when written in Hebrew. The Letters in Hebrew, and in the Secret Alphabet called the Celestial, compose the Names of Spirits. Round the Pentacle is:—“He gave them hail for rain, and flaming fire in their land. He smote their vines also, and their fig-trees,”—Psalm cv.