The Landmine is a trap (Defensive Building) that can kill any enemy if they get in the triggered zone.
The Landmine starts as the Spike Trap from level 1 to 6 and to the Land Mine at level 7 and above.
As the Landmine phase, when the enemy triggers the trap by walking into its zone, spikes would pop up, killing any enemy that is nearby.
(From level 7 upwards, Landmine does splash damage.)
Defensive Strategies[]
Put the Landmine where the enemy will most likely attack (weak points or spots in your defence such as an exposed Ballista/Cannon Tower that is not protected by Walls or other defensive buildings)
Put more than one Spike Traps close to defensive buildings so they can instantly kill tanky units when they get close to it