This skill adds to the Set Trap skill, allowing you to make the trap a magical trap. You will need the tools to make the magic trap, such as a rune stone with the spell ready to activate.  The level of trap difficulty determines the success roll check:

• Easy Magical Trap = Easy Arcana check
• Normal Magical Trap = Normal Arcana check
• Hard Magical Trap = Hard Arcana check
• Impossible Magical Trap = Impossible Arcana check