Updated for Town Hall 18 (October 2026).
The Stone Slammer is a flying Siege Machine that hunts defenses, crushing each one with heavy boulder drops that also shatter nearby Walls, and releases your Clan Castle troops when it is destroyed. It unlocks with the level 3 Workshop at Town Hall 12. Level 6, added for Town Hall 18 in February 2026, is the current max with 7,200 hitpoints and 820 damage per second.
How the Stone Slammer works
Think of it as a giant, armored Balloon. It flies, it goes for the nearest defense, and it hits hard but slowly (one slam every 2.5 seconds). It moves faster than a Balloon, though, and it has thousands of hitpoints instead of hundreds.
Each slam has two parts that land together:
- A heavy hit in a 1-tile radius, which normally lands only on the targeted defense.
- A wider shockwave over 3 tiles that deals full damage within 2 tiles and less toward the edge. It does 25 times damage to Walls, so whole Wall sections around the target crumble.
The targeted defense takes both parts. When the Slammer itself is destroyed it deals 500 damage where it falls, much like a Balloon’s death bomb.
Targeting and what it carries
The Stone Slammer targets defenses only, as long as any are left, and ignores other buildings and defending troops on the way. It does not head for the Town Hall and does not break open when it reaches a target. That sets it apart from the Wall Wrecker, Battle Blimp and Log Launcher, which all path toward the Town Hall. Your Clan Castle troops stay inside until the Slammer is shot down, so they come out wherever it finally falls. With an empty Clan Castle nothing comes out, but the Slammer is still a heavy flying tank on its own.
A level 6 or higher Clan Castle can receive Siege Machines as donations, so Town Hall 10 and 11 players can use a donated Slammer before they can build one. The Clan Castle level caps the donated level: a level 6 Clan Castle receives up to a level 2 Stone Slammer, and level 10 or higher receives a level 6 one.
Stone Slammer levels
Upgrade it in the Laboratory with Elixir. Costs and times are standard values before a Gold Pass discount. Building it in the Workshop is free and instant.
| Level | Damage per second | Main hit damage | Hitpoints | Research cost (Elixir) | Research time | Lab level | Town Hall needed |
|---|---|---|---|---|---|---|---|
| 1 | 400 | 1,000 | 5,600 | None | None | None | 12 |
| 2 | 500 | 1,250 | 5,900 | 2,500,000 | 2d | 10 | 12 |
| 3 | 600 | 1,500 | 6,200 | 3,500,000 | 3d | 10 | 12 |
| 4 | 700 | 1,750 | 6,500 | 6,500,000 | 7d | 11 | 13 |
| 5 | 750 | 1,875 | 6,800 | 10,000,000 | 9d | 13 | 15 |
| 6 | 820 | 2,050 | 7,200 | 26,000,000 | 13d 12h | 16 | 18 |
Level 5 is the cap for Town Halls 15, 16 and 17. The shockwave adds 100-200 damage at level 1, rising to 300-600 at level 5.
How to use the Stone Slammer
LavaLoon and Balloon armies
The Slammer fits air attacks best. In a LavaLoon, it rides behind the Lava Hounds and lands big hits on defenses while the Hounds soak fire. In a Balloon army it acts as a tank in its own right, taking hits and Seeking Air Mines that would otherwise pop Balloons.
Opening paths for a Queen walk
All the broken Walls leave a clear lane for an Archer Queen walk, and she cleans up the non-defense buildings that the Slammer and Balloons skip.
Dealing with its counters
Single-target Inferno Towers and the Monolith are its biggest threats. Drop a Freeze Spell on them as the Slammer arrives, or use a Haste Spell so your Balloons reach the Inferno before it burns the Slammer down.
Your own spells don’t affect it: Siege Machines ignore Rage, Heal and the other spells you cast. Since April 2026 they are also immune to Life Gem effects, the Apprentice Warden‘s aura and the Town Hall 14-16 poison.
How to defend against the Stone Slammer
- Set Inferno Towers to single-target mode and cover them with Wizard Towers, so the Balloons die fast and the Infernos can focus on the Slammer.
- A Monolith deals bonus damage based on the target’s health, which hurts high-hitpoint targets like this one.
- Seeking Air Mines take a big chunk of its health and can make it fall early, dropping its Clan Castle troops on the edge instead of the core.
- An Inferno Dragon in your Clan Castle can also melt it.
Recent changes
- June 12, 2023: level 5 added; upgrade costs and times cut for levels 2 to 4.
- March 2025, “Clash Anytime” update: building Siege Machines takes no time.
- February 23, 2026: level 6 added for Town Hall 18.
- April 27, 2026: all Siege Machines became immune to the Town Hall 14-16 poison, Life Gem effects and the Apprentice Warden aura, and started taking damage from Firemite fires.
Stone Slammer FAQ
Does the Stone Slammer go to the Town Hall?
No. It targets defenses until none are left. Only then does it hit the nearest building, Town Hall included.
What Town Hall unlocks the Stone Slammer?
Town Hall 12, with a level 3 Workshop.
Is the Stone Slammer an air unit?
Yes. It flies, so ground-only defenses can’t hit it, and Air Defenses and Seeking Air Mines can.
Sources: Supercell release notes (February 2026 update, Sound of Clash update, Clash Anytime update), in-game data.
