Land Mine

Land mines are placed on the ground and are triggered to explode when an enemy or the player walks over it, dealing around 250 base damage. They can only be purchased from the Demolitionist if Plantera and at least one Pirate Invasion has been defeated. They are not to be confused with the mines fired and placed by the Proximity Mine Launcher, which uses rockets purchased from the Cyborg as ammo, despite the name of the weapon and the projectile.

Trivia

 * They look similar to the landmines in the Worms series.
 * In Multi-Player, if the player is killed by a Land Mine (by placing it under a player),they will usually freeze then die. The death message will read that the landmine belonged to the player it killed, even if it was set by another player.