Quartile Scutum

Star Magic: Quartile Scutum (星魔法『・』) is a Star Magic spell.

Description
With an open grimoire, the user generates four stars and arranges them into a rectangle. Beams of light connect the stars along the edges of the rectangle, forming a defensive barrier that is capable of withstanding devil-powered magic.

Trivia

 * Scutum is Latin for "shield".
 * It is also named after an internationally recognized constellation.