"The Wall Wrecker exists for two simple purposes: smash through anything that it comes across and deliver the Clan Castle troops straight to the heart of the village. Built from heavy-duty materials, it can take a pummeling before breaking down. Immune to spell effects."
The Wall Wrecker is the first Siege Machine you unlock, available as soon as the Workshop is completed.
The Wall Wrecker considers the Town Hall as its primary target, and will fight its way through enemy buildings and Walls to reach its location, regardless of whether or not the Town Hall is still standing. When the Wall Wrecker successfully reaches the Town Hall (or its remains), it automatically breaks apart to reveal the Clan Castle troops inside.
Wall Wreckers can still be used if there are no Clan Castle troops, however, when it is destroyed, nothing will spawn from it.
As a Siege Machine, it cannot be affected by spells placed by the player. The Wall Wrecker cannot also be healed by the Healer.
Though a Wall Wrecker cannot be healed by a Healer, it will be affected by the Grand Warden's Life Aura and Eternal Tome abilities.
Wall Wreckers can be used as a substitute to Golems and Wall Breakers in a kill squad, due to their abilities stemming from their high hitpoints and damage against Walls. However, due to their unique behavior of moving towards the Town Hall, its path must be considered if you intend to use them in a kill squad, as it can differ drastically, especially if the Town Hall is off-center.
If air Troops are placed inside the Wall Wrecker, they will be more vulnerable to air Traps upon being deployed, because the Wall Wrecker will not be able to trigger these traps. While it is still feasible to place air troops in a Wall Wrecker in certain situations (such as to support a ground phase), this means that the air troops will be at a disadvantage (in a worst-case scenario, they may be killed upon being deployed).
It is essential to have many high-level defenses (ideally single-target Inferno Towers) to be positioned where Wall Wreckers are likely to be spawned to kill them before they can penetrate through your Walls, and to quickly get rid of the Clan Castle troops inside as well, if any.
Initially, the Wall Wrecker is a red wooden box with a hatch on top and brown edges. It has a battering ram on the bottom.
At level 2, it gains metal plating on the front. It gains more metal supports at the top.
At level 3, it gains spikes on the metal plating and the bottom edges become metal as well. The head of the battering ram becomes the head of a ram.
At level 4, the spikes on the metal plating becomes golden, as well as some of the corner bracings.
The Wall Wrecker was added in the June 11, 2018 "Town Hall 12" update, with 3 levels.
The June 29, 2018 balance changes reduced damage per second and hitpoints for Wall Wrecker.
The October 23, 2018 gave the Wall Wrecker an update:
Reduced training times for Wall Wrecker to 20 minutes for all levels.
The Wall Wrecker's training costs reduced to 100,000 Gold across all levels.
Wall Wrecker deployment on the UI will now default to what was previously used.
Donating a Wall Wrecker will now give 30XP instead of 1XP and counts as donating 30 units.
Fixed Wall Wrecker getting stuck on walls and obstacles.
Fixed battle ending too early if only empty undeployed Wall Wrecker is remaining.
The December 10, 2018 update fixed (again) Wall Wreckers from getting stuck on decorations and fixed a bug where a donated Wall Wrecker gives 30 housing space to Clan Games tasks.
The June 18, 2019 update fixed a bug where deploying Wall Wrecker 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.
The March 30, 2020 update fixed a bug where the Wall Wrecker gets stuck on Walls.
The June 22, 2020 update added the level 4 Wall Wrecker and improved the Wall Wrecker's pathing.
The December 7, 2020 update reduced the zig-zag movement of Wall Wrecker when deployed.
Out of the five Siege Machines, the Wall Wrecker is the only one to have one troop in the artwork.
It is unknown how the Wall Wrecker still operates without any Clan Castle troops, as no one pushes the ram to break the buildings and the Walls.