Updated for Town Hall 18 (October 2026).
The Multi Mortar is a Builder Base splash defense, unlocked at Builder Hall 5, that lobs a burst of 3 to 5 mortar shells at ground troops from up to 11 tiles away. It cannot hit air troops or anything standing within 4 tiles of it. Builder Base 2.0 (May 2023) made each shell much stronger, so it is now one of the better answers to swarms of small troops.
How the Multi Mortar attacks
Instead of one big shell, the Multi Mortar fires a quick volley. Each shell does modest damage on its own, but all of them land in the same area with a 3-tile splash, so a group of troops takes the full volley together. Level 1 fires 3 shells per burst, levels 2 to 9 fire 4, and level 10 fires 5 while also shortening the pause between bursts to 5 seconds.
- Range: 4 to 11 tiles. Troops closer than 4 tiles are in its blind spot.
- Targets: ground only.
- Size: 3×3. You get one Multi Mortar.
The blind spot and the long reach together mean it usually ignores your front-line tank once that tank is close and keeps firing at whatever is behind it. That is exactly where support troops like Sneaky Archers, Cannon Carts and Night Witches tend to stand.
Multi Mortar levels and stats
| Level | Builder Hall needed | Shells per burst | Damage per shell | Time between bursts | DPS (in-game) | Hitpoints | Cost (Builder Gold) | Build time |
|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 3 | 45 | 6s | 22 | 500 | 600,000 | 8h |
| 2 | 5 | 4 | 45 | 5.5s | 27 | 575 | 700,000 | 12h |
| 3 | 5 | 4 | 50 | 5.5s | 30 | 660 | 800,000 | 1d |
| 4 | 5 | 4 | 55 | 5.5s | 33 | 760 | 1,000,000 | 2d |
| 5 | 5 | 4 | 60 | 5.5s | 36 | 875 | 1,200,000 | 3d |
| 6 | 6 | 4 | 66 | 5.5s | 40 | 1,050 | 1,600,000 | 5d |
| 7 | 7 | 4 | 73 | 5.5s | 44 | 1,250 | 2,500,000 | 7d |
| 8 | 8 | 4 | 80 | 5.5s | 49 | 1,450 | 3,500,000 | 9d |
| 9 | 9 | 4 | 88 | 5.5s | 53 | 1,650 | 4,500,000 | 11d |
| 10 | 10 | 5 | 88 | 5s | 62 | 1,850 | 5,500,000 | 12d |
The DPS column is the in-game figure. Real damage depends on how many shells in each burst actually land on troops, so against a tight clump it hits harder than the number suggests, and against one spread-out unit it hits softer.
Where to place the Multi Mortar
Put it near the middle of the stage you place it on. From the center, its 11-tile reach covers most of the base, and attackers have to cross a lot of ground to reach the blind spot.
Pair it with a Crusher. The Crusher’s short slam covers some of the area the Multi Mortar cannot hit, although its range is too short to cover the whole blind spot. Neither one shoots air, so make sure Firecrackers, Air Bombs or a Roaster cover the same area.
It does good work against Bombers. When the Bomber’s level is no more than twice the Multi Mortar’s level, one volley of 4 shells is enough to kill it. It also wipes out the Skeletons dropped by a Drop Ship and hurts packs of Raged Barbarians.
How to attack a Multi Mortar
- Go air. Baby Dragons, Beta Minions, Drop Ships and the Battle Copter take no damage from it at all. Skeletons from a Drop Ship are still at risk once they land, unless they land close to it.
- Lead with a tank such as a Boxer Giant or the Battle Machine. Keep the support behind it, but do not let every troop walk into the blind spot at the same time, or the mortar will switch to a new target.
- Spread your troops. A tight group of Raged Barbarians loses health to every volley, while a line of them forces the mortar to lock onto one at a time.
- Get close. Any troop that reaches the 4-tile blind spot can hit it without taking fire from it.
Multi Mortar and the Geared Up Mortar
The Multi Mortar also counts for the Home Village. A Multi Mortar at level 8 or higher (Builder Hall 8) lets the Master Builder gear up a level 8 or higher Mortar (Town Hall 10) so it fires in bursts too. See the Master Builder’s Hut for how gearing up works.
Multi Mortar changes
- May 22, 2017: added with the first Builder Base, with 5 levels. Levels 6 to 9 followed between June 2017 and June 2019.
- May 15, 2023 (Builder Base 2.0): level 10 added; damage per shell raised at every level (level 9 went from 55 to 88); level 1 cut from 4 shells to 3, matching its three barrels; range cut from 4-13 tiles to 4-11 tiles to fit the smaller map; hitpoints raised from level 6 up.
For how the new two-stage attacks work and which defenses go where, see the Builder Base 2.0 guide.
Multi Mortar FAQ
Can the Multi Mortar hit air troops?
No. It only targets ground troops.
What Builder Hall unlocks the Multi Mortar?
Builder Hall 5. Its max level is 10, at Builder Hall 10.
How many shells does the Multi Mortar fire?
3 at level 1, 4 at levels 2 to 9, and 5 at level 10.
Sources: Supercell release notes (Builder Base 2.0 full patch notes (Supercell, May 15, 2023)) and in-game data.
