Sandalphon (サンダルフォン, Sandarufon) is the 10th angel of the Kabbalah.
Along with Metatron, Sandalphon was recovered by the Stea Republic 13 years prior to the start of the story. Like Michael, a clone was created in the form of Lilly, Cross's sister, as Solomon's Key intended to activate his latent powers. Jio, possessed by Satan, destroyed the clone. During the 4 year time skip, Ruby is discovered to be the host of the Angel. So far, Sandalphon's powers include the ability to change an object's size and shape, along with enhanced physical strength.