Proximity mine
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An anti-tank or anti-personal explosive that is planted in the ground to surprise the enemy and disable them. Often used in video games as a weapon, one such being James Bond 007: Goldeneye. This is a very effective way to impede the enemy's movements, and is also very dangerous to friendly units.
Also General Juhziz have a special demo trap name called : Advanced Demo Trap, which have more fire power than standard ones.