This form of magic allows the user to create and set magical traps. The user draws a magic circle, pours mana into it, and places it in the path of a person or object. The more complicated a trap is, the more time it takes to draw. Similarly, more powerful traps require more mana. Most often they are placed on surfaces, such as floors and walls, but they can also be placed in midair.
Once the magic circles are drawn and placed, they are invisible to everyone but the user until activated. However, magic sensors can locate traps, and the traps' locations could be magically shared with allies.
A more complex type of trap is the counter trap, which absorbs an incoming spell, copies it, and sends it back with twice the power and speed. The copy even duplicates the magic attribute and special properties of the spell. A spell of significant power could overwhelm and break a counter trap.