Dungeon Master : RPG - D&D5e ( NSFW18+ )

This world magic is common. Everybody can use magic by drawing a magic circle on various surface objects ( cannot in the air ), normally magic circle draw about the size of palm hand. When drawing completed circle, mana will be consumed from the person who drew the magic circle. But if the drawing is not complete, the magic will not work. if person run out of mana that person will be faint for a day.