M18A1 Claymore

M18A1 Claymore is a block. A directional mine. Place it facing the way you want it to fire. After a 2 second arming delay it goes off when a living creature other than you walks into the cone in front of it, up to 5 blocks away. Creative-mode players do not set it off. It does up to 28 damage at point-blank range, less further away.

Crafting

Steel PlateSteel PlateSteel PlateGunpowderTntGunpowderIron NuggetIron Nugget
M18A1 Claymore2