Swallowtail

Swallowtail is a special mark.

Overview
This six-pointed star can be used to store magic for later use.

While wandering around after becoming Magic Emperor, Julius Novachrono discovers a magic tool with the mark inside it. Julius finds that the mark is compatible with his Time Magic so he adds a blue tattoo to his forehead and stores additional time within it in case he dies. When he does die, the tattoo dissolves and hours later, the magic rejuvenates Julius's body, reviving him.

Trivia

 * The mark's name is similar to Secre's family name.
 * In the anime, the magic tool is one of the inventions created by Lemiel and Secre.