Leylines are the natural and artificial spellforms that guide and influence magic. Natural leylines span the world and are believed by many to have given the gift of magic to Venriel. Duplication of these leylines has allowed for the effects of natural leylines to be remade in smaller scale. More intricate leylines lead to more complex effects, though the system typically falls back onto simpler principals.
For example, placing the rune for fire (leyline characters are typically known as runes) and powering the leyline would produce fire. Adding a circle (representing a cycle) to surround the fire rune would cause the fire to persist. Surrounding the circle in a square (representing enclosure) would cause the flame to become smaller and more contained. By combining these, a simple light can be created that will last longer than a normal oil-based lamp.
More complex items, such as Magitech are made of multiple, interlinking leylines that work to create a specific affect. Those who practice Artifice are typically the most well-versed in this work compared to engineers, who focus on the mechanical side of technology.