- The Stone Slammer is the third Siege Machine you unlock, available when the Workshop is upgraded to level 3.
- Stone Slammer prioritize defensive structures above all other targets, and will bypass all other types of enemy buildings and troops while any defenses remain on the battlefield. This is true even if they are under attack by enemy Clan Castle troops, heroes or Skeleton Trap skeletons. Note that like all troops that prioritize defenses, Stone Slammer do not consider the Clan Castle to be a defense regardless of whether or not it contains enemy troops, but do consider the defending Grand Warden and the level 12 or 13 Town Hall (if its Giga Tesla or Giga Inferno has been triggered) to be defensive buildings.
Once all defenses are destroyed, Stone Slammer become like any other troop with no preferred target; they will attack the nearest building to them regardless of type, and will turn and attack enemy units if they become aware of any nearby.
- The Stone Slammer can still be used if there are no Clan Castle troops, however, when it is destroyed, nothing will spawn from it.
- The Stone Slammer can be described as an incredibly high hitpoints, high damaging Balloon, as it shares the Balloon’s relatively slow movement speed and high DPS with low attack speed, as well as defense targeting. However, the Stone Slammer has considerably more DPS.
- The Stone Slammer’s attack consists of two parts that act simultaneously: one high-damage hitbox with low splash radius (1 tile) that usually only affects the building it’s attacking, and a low-damage hitbox with high splash radius (3 tiles) that does 25x damage to Walls. The low-damage hitbox has a falloff effect that does less damage when between 2-3 tiles away from the Stone Slammer. Additionally, the Stone Slammer does some damage when destroyed.
- As the two hitboxes overlap, the targeted building that gets hit by the first hitbox will get hit by the second hitbox as well, meaning the Slammer effectively deals more damage than that done by the first hitbox alone.
- The high splash radius, high wall damage part makes the Stone Slammer a very efficient way to complete challenges whose objective is to break a certain amount of Walls; even more efficient than the Wall Wrecker.
- Though a Stone Slammer cannot be healed by a healer, it will be affected by the Grand Warden’s Eternal Tome ability.
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