Spell circles are how witches on The Boiling Isles cast spells, which is drawing a circle in the air using either their fingers or a staff. The intensity of the spell depends on the size of the circle. The bigger it is the more powerful the spell.
Drawing the Spell Circle can also be done using a pen or pencil as long as a glyph is included. It is revealed in "The Intruder" that in order to cast a specific spell, a specific glyph within the circle must be included, which can be seen for a brief moment. It is reasonable to assume that drawing the glyph within the circle was how witches use to do magic until these practices were forgotten when they started mastering more efficient methods.
According to "Adventures in the Elements" the Boiling Isles is full of magic glyphs hidden within nature. The light glyph can be found in the stars and the ice glyph within snowflakes.
List of glyphs
The glyph for illumination is a large triangle in the circle with a smaller triangle and circle on top. Down the middle a long line with two smaller lines across, side by side within the large triangle.
When cast it generates a floating sphere of light. The intensity of the spell can be changed depending on the size of the glyph/spell circle. The light spell is considered a basic spell that can be cast at a very young age.
The glyph for conjuring ice is a large diamond with a line down the center, sat on another line across the bottom of the circle. Across the diamond is a curved line and sometimes a smaller diamond is included at the bottom.
When cast it causes a pillar of ice to form. The diameter, height and speed of growth of the pillar is dependent upon the size of the glyph.
The Spell Circle is similar to a Magic circle, which is a circle of space marked out by practitioners of many branches of ritual magic.
The Spell Circle patterns are similar to glyphs, which are elemental symbols within an agreed set of symbols, intended to represent a readable character for the purposes of writing.