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Stone Slammer info

"The Stone Slammer is a heavy-duty, flying mountain that targets defensive buildings by flattening them with giant boulders and causes earthquakes. Immune to spell effects."

Stone Slammer1
Level 1
Stone Slammer2
Level 2
Stone Slammer3
Level 3
Stone Slammer4
Level 4
Stone Slammer5
Level 5


  • The Stone Slammer is the third Siege Machine you unlock, available when the Workshop is upgraded to level 3.
  • 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 damage with low attack speed, as well as defense targeting.
  • 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 activated Town Hall weapon (if any) 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 and can fight back against them. However, they will not switch targets to enemy units until their previous target was destroyed.
  • 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'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, just like a Balloon does.
    • 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.
  • Like all other Siege Machines, it is immune to spell effects placed by the player, but it can be affected by the Grand Warden's abilities.


Offensive Strategy

  • Stone Slammers, alongside the Flame Flingers and the Battle Drills, have one noticeable difference from the rest of the Siege Machines: instead of pathing towards the Town Hall like the Wall Wrecker, Battle Blimp and Log Launcher they go for defenses and do not self-destruct automatically upon reaching a target. As such, they can be used to clear defensive compartments and funnel certain attacks.
  • One of the best companion armies for this siege machine is the “Lava-Loon” strategy, for it will hide behind the Hounds and do big hits of damage.
    • Also, the Wall destruction makes a clear path for a Queen Walk, which has the potential to do heaps of clean up, for she will target the buildings the Slammer and Balloons won't.
    • It can also act as a tank for balloon-based armies, due to its high HP, and its high damage against defenses.
  • The biggest threat to this siege machine is the single-target Inferno Tower, so it is wise to use the Haste Spell to speed up the Balloons, therefore they will reach the Inferno Tower before it deals critical damage. Alternatively, using Freeze Spells on the Inferno Tower can be a good idea.

Defensive Strategy

  • Guard your Inferno Towers (and set them to single-target mode) with Wizard Towers, so they can take out lots of Balloons at once, as this allows the Inferno Towers to do maximum damage to the Slammer.
    • Monoliths also work against the Stone Slammer effectively due to their damage-based bonus damage.
  • Seeking Air Mines can do large amounts of damage to Stone Slammers and makes them more vulnerable to breaking early.

Upgrade Differences

  • The Stone Slammer undergoes significant visual changes at level 3 and 5.
    • Initially, the Stone Slammer is a balloon-like, roped machine with wooden supports and nails reinforcing the bottom.
    • At level 2, the nails become gold and the wooden reinforcement pieces are plated with metal inserts.
    • At level 3, the top junction of ropes gleans golden plates, while the metal inserts become gold.
    • At level 4, the supports turn into a metal-like material, while still retaining the golden bracers. The Balloon's colour also gets slightly darker.
    • At level 5, metal plating fitted with golden spikes are added on the corners of the balloon. The golden bracers are replaced with spikes.


Preferred Target Attack Type Movement Speed Attack Speed Workshop Level Required
Defenses Area Splash 1 and 3 tile Radius (Ground Only) 16 2.5s 3
Building Time of Stone Slammer
Workshop available Workshop upgrading
20m 40m
Damage per Second
Damage per Attack Damage Damage when Destroyed
Research Cost
Research Time
Laboratory Level Required
Hitbox 1 Hitbox 2*
1 400 1,000 100-200 500 5,600 N/A N/A N/A
2 500 1,250 150-300 500 5,900 3,800,000 4d 10
3 600 1,500 200-400 500 6,200 5,000,000 5d 10
4 700 1,750 250-500 500 6,500 8,500,000 8d 11
5 750 1,875 300-600 500 6,800 15,000,000 10d 13

*This second hitbox does its maximum damage for all targets within 2 tiles of the impact, and minimum damage for targets just within the splash zone of 3 tiles. The hitbox also does x25 damage to Walls.


Patch Type Description
December 6, 2018 Sneak Peek Announced the Stone Slammer, with 3 levels.Stone Slammer1Stone Slammer2Stone Slammer3
December 10, 2018 Update Added the Stone Slammer.
December 12, 2018 Maintenance Break
  • Reworked damage multipliers of Stone Slammer against Walls - increased maximum damage multiplier, but decreases damage for targets outside the immediate vicinity of the Slammer.
  • Reduced hitpoints at levels 2 and 3.
    • Level 2: 6,200 -> 5,900 Hitpoints
    • Level 3: 6,800 -> 6,200 Hitpoints
June 18, 2019 Update Fixed a bug where deploying Stone Slammer or other Siege Machines to start a battle now cause defending Grand Warden to retreat into statue form, just as he does when any other unit is deployed.
June 18, 2020 Sneak Peek Announced the level 4 Stone Slammer.Stone Slammer4
June 22, 2020 Update Added the level 4 Stone Slammer.
June 16, 2021 Optional Update Fixed an issue that made switching to donated Stone Slammer and other Siege Machines impossible.
June 12, 2023 Update
  • Added the level 5 Stone Slammer.
    Stone Slammer5
  • Reduced upgrade times for levels 2, 3 and 4.
    • Level 2: 5d 12h -> 5d Time
    • Level 3: 7d -> 6d Time
    • Level 4: 12d -> 9d Time
  • Reduced upgrade costs for levels 2, 3 and 4.
    • Level 2: 4,200,000 -> 3,800,000 Elixir
    • Level 3: 5,600,000 -> 5,000,000 Elixir
    • Level 4: 10,500,000 -> 8,500,000 Elixir



  • The Stone Slammer, Flame Flinger, and the Battle Drill are the only Siege Machines which has a preferred target of defenses.
  • In the artwork and icon, the Stone Slammer has patches on the Balloon, though none of its level sprites have them.
  • In the icon image, a Wizard and a Bowler is seen aboard.
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