A Demon trap is a magic device resembling a landmine. They are created by the sacrifice of a living being. Developed by the Vikings to protect their longhouses over the winter. Also known as 'Dog batteries'. Varvara Sidorovna is known to have used them.
When making a demon trap, a spirit is trapped at the point of death.
When handling demon traps one could use wood. The younger and greener the wood is, the better.