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 and not destroying any tiles or walls around it. They can only be purchased from the Demolitionist if Plantera and at least one Pirate Invasion have been defeated and the game is singleplayer, but on console you can only buy it during night until Plantera is defeated then he will sell it all the time. 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. They are electrical devices as they show wires when held, and can be triggered by Mechanism triggers such as the Switch.

Trivia

 * They look similar to the landmines in the Worms series.
 * In Single-Player, if a Softcore character is killed (or kills themself) with a Land Mine they'll respawn with full health and will not drop money on death. This is because it counts it as a PvP death. (It works with Hellfire arrows and Explosive bullets as well.)
 * NPCs can be harmed by the Land Mine. This makes acquiring the Peddler's Hat easier and less risky than attracting monsters to harm the Travelling Merchant. The Clothier may be slain the same way to acquire the Red Hat, however doing so with the Land Mine will not spawn Skeletron.
 * 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.

History
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