Landmines are a type of Spawner added to world gen by Deadly World. These spawners are similar to Mob Spawner Traps, however, instead of spawning a mob, these just spawn live TNT. These spawners will usually destroy themselves, and will not spawn with a chest. These spawners have a chance of replacing a normal Mob Spawner. The rarity, as well as the destructive power of these spawners, can be changed in the config file.