"A secret symbol left by Caryll, runesmith of Byrgenwerth.
The Great One Oedon, lacking form, exists only in voice, and is symbolized by this rune.
Those who memorize it enjoy a larger supply of Quicksilver Bullets. Human or no, the oozing blood is a medium of the highest grade, and the essence of the formless Great One. Both Oedon, and his inadvertent worshippers, surreptitiously seek the precious blood."