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“The Furnace spawns one Fire Spirit at a time. It also makes great brick-oven pancakes.”

The Furnace is a Rare card that is unlocked from the Hog Mountain (Arena 10). It spawns a building with moderate hitpoints. Every 5 seconds, the Furnace will passively summon a Fire Spirit. When defeated, it will also spawn 1 Fire Spirit. It appears to be a cast-iron steam train furnace with a bubbling cauldron holding magenta fluid resembling Elixir on top of it. It is also covered with various other props, including a ladder on the side of it, and a pile of firewood on the other. A Furnace card costs 4 Elixir to deploy.


For Battle Decks with this card, click here

  • The Furnace can act as a useful defense as well as a support building, thanks to its Fire Spirits which deal area damage.
  • The Furnace can be used with other spawners like the Barbarian Hut, Tombstone, or Goblin Hut, to overwhelm the opponent. This is known as a Spawner strategy and works at all Levels. This deprives the opponent of any Elixir as they must constantly defend against the spawned troops, leaving the player free to devastate them.
    • On the contrary, the Furnace is effective at preventing other spawners from building momentum due to the fact that the Fire Spirits spawned deal splash damage and can take out spawners easily.
    • Since the Fire Spirits spawned from the Furnace explode on impact, Skeletons from the Tombstone can distract Fire Spirits easily and stop almost all the waves of Fire Spirits.
    • The Goblin Drill can be used to eliminate a Furnace placed behind your opponent's Crown Towers. The drill absorbs one Fire Spirit and the Goblins can rapidly take it out on top of forcing a response from your opponent.
  • The Furnace is a great support card if placed behind a tank, eliminating nearly any type of cheap card that the enemy will place down to counter it. For example, a great combo is Hog Rider or Royal Giant with a Furnace. If the opponent spawns cards such as Minions or Goblins to either distract or destroy, the Fire Spirits will take them out, and if left unchecked behind a tank can decimate the Tower with their powerful splash. The Furnace can also be preplaced for when the player wants to start a tank push from the King Tower, as they will discourage the opponent from attacking.
  • The Furnace is good at supporting counterattacks as it takes out many small troops, such as Minions, Spear Goblins, and Goblins, that opponents may play due to being low on Elixir from their attack. By placing it in advance, the player will not have to worry about cards like Minions, as the spawned Fire Spirits will take care of them.
    • This tactic can also work against bulkier swarms, such as Barbarians. Although the Barbarians can survive multiple of them, they will be slowly weakened enough that they will not provide any counterpush value afterwards. If placed at a safe distance, it can even counter them with the assistance of a tower troop, and no damage being dealt to the Furnace.
  • If no other options are available, a Furnace can stop a push with low-hitpoint troops since it will immediately spawn at least one Fire Spirit, wiping out a lot of the push and acting as a distraction. This is especially useful against the Minion Horde, as the first wave and the death wave is enough to fully stop it and for a positive Elixir trade.
  • Keep in mind that the spawned Fire Spirit will be able to attack the Tower Princess. Due to the Furnace's 28-second lifetime, this will deal valuable chip damage to a Tower. However, the spawned Fire Spirits will be defeated by the Cannoneer and Dagger Duchess before they get a chance to connect, so they can be ignored unless supported with a tank.
  • The Furnace can spawn up to 7 Fire Spirits (value of 7 Elixir), creating a maximum profit of 3 Elixir. However, since the Fire Spirits are instantly killed when they attack, they can be easily absorbed by high-hitpoint troops, such as an Ice Golem. It is advised to defeat those troops so that the Fire Spirits can continue on their way to the Crown Towers without getting distracted.
    • The Evolved Knight is great at absorbing the Fire Spirits, thanks to his shield boost reducing the damage that he will take from them. This will allow him to reach a Furnace placed at the center of the opponent's side and take it out.
    • Another good unit for the tactic is the Battle Healer. Even though she will take full damage from them, her passive healing will quickly heal parts of the damage, allowing her to easily survive any upcoming Fire Spirits. She is also able to hover over the river, which allows her to easily reach a center-placed Furnace and destroy it.
    • Similarly, a Royal Ghost can be utilized against the Furnace. Much like the Battle Healer, he can reach the Furnace from the river to destroy it. The Royal Ghost's invisibility will also allow him to get the first hit on the Fire Spirits, defeating them without taking any damage.
    • Although it cannot directly attack the Furnace, the Goblin Cage can be a decent tank against the spawned Fire Spirits from the Furnace, and it less of an issue for it to take damage, due to its complete passivity. However, the Goblin Cage has a shorter duration than the Furnace, which will force the Goblin Brawler to absorb any remaining Fire Spirits if he travels towards the same lane, removing any opportunity for a counterattack.
  • Ranged troops that can OHKO the Fire Spirits such as Bomber and Bowler are good counters to the Furnace, as they can instantly defeat them without taking any damage. The constant spawning of the Fire Spirits will let them stay engaged in the fight for longer, allowing the player to accumulate more Elixir for a counterpush.
    • Even though it is stationary, a Tesla can counter the Furnace for a neutral Elixir trade, thanks to its longer duration and ability to OHKO the Fire Spirits. Other buildings like the Bomb Tower and Cannon are less effective, as their lower damage will allow the Fire Spirits to accumulate damage and destroy said buildings.
  • Fast melee troops like the Mini P.E.K.K.A. are a great pair with the Furnace's Fire Spirits, as the Fire Spirits take out any Goblins, or other frail swarm (excluding Skeleton Army), allowing them to head to the Tower quickly. However, this strategy is vulnerable to heavy tanks, such as a P.E.K.K.A.
  • Poison and Earthquake are powerful counters to the Furnace, as they will not only damage the spawner but also hit the Fire Spirits, as well as possibly hitting other units. However, the player can take advantage of the absence of those spells and deploy other cards that are vulnerable to those spells, such as a Graveyard. Alternatively, those other cards could be used to bait those spells, so that the Furnace can be used unharmed.
    • Other spells like Lightning and Rocket can work similarly, however they are a negative Elixir trade. Try to use them against it if they can hit additional targets with it, such as a Crown Tower.
    • When using the Void against the Furnace, the Void should be used in such a way that it will only target the Furnace, allowing it to be destroyed with just 2 strikes from the spell. Note that the opponent can place down a swarm like Skeletons or Goblins to delay its destruction, or in the case of the latter, to prevent it entirely.
    • While a Graveyard cannot deal damage directly, its spawned Skeletons can deal significant damage to a Furnace placed behind the Crown Tower. The high amount of Skeletons and spawn pattern prevents the opponent from defending their building quickly and it will result in the building being destroyed without much resistance. This should not be done however if the building is close to the King's Tower since it can activate it early. A Miner can be a good alternative for a lower risk and a lower Elixir cost.
  • The Furnace can counter a Skeleton Barrel, albeit for a slight negative Elixir trade. Despite this, the building will stay relatively healthy to spawn more Fire Spirits to chip the Tower Princess. A similar tactic can also be applied to the Wall Breakers.
  • For only 1 Elixir, an Electro Spirit can deny a few waves from a Furnace. Make sure that it is placed in such a way that it jumps onto a Fire Spirit and then chains onto the Furnace.
  • A Furnace placed directly behind the Crown Tower can stop a center-placed Goblin Barrel. The Furnace will be close enough to the Crown Tower, that the first Fire Spirit will be close enough to hit all three Goblins. However, it is a negative Elixir trade, so only do this if you lack better counters.
  • Even though Minions are weak to Fire Spirits, when split, a singular Minion can absorb 2 Fire Spirits spawned from a Furnace. This is a good way to save other troops from the damage caused by 2 Fire Spirits, while also attacking the other lane.
  • Mirroring it can spawn two Fire Spirits at a time, which provides fast and heavy area damage support for tanks. However, Fire Spirits themselves are weak to area damage cards like spells, and placing the second Furnace close to the first can allow the opponent to get a large positive Elixir trade by targeting both buildings at once with spell cards.
    • To combat this, place one Furnace at the back and another at the center of the map staggered slightly to the side. Unless the opponent mirrors an Earthquake, both buildings would be able to deal considerable chip damage.
    • Alternatively, the player can place the mirrored Furnace in the other lane. This will allow to pressure both lanes as well as discourage the opponent from attacking either lane due to the Fire Spirits' defensive presence.
  • A poorly placed Furnace can be sniped by ranged troops like the Princess, Flying Machine, Dart Goblin, and Magic Archer. This can be helpful to use when the Furnace is used to distract a building-targeting troop like a Giant.
  • The Mother Witch is a great counter to the Furnace. Even though she cannot OHKO the Fire Spirits, she has the range and attack speed to defeat them before they jump on her, allowing her to spawn Cursed Hogs from them. Those Cursed Hogs will distract any additional Fire Spirits, while the are proceeding to the Furnace, eventually destroying it.
  • The Furnace can counter an Archer Queen for a +1 Elixir trade. The Archer Queen does not deal enough damage to OHKO the spawned Fire Spirits, and this will allow them to accumulate damage on her.
  • Avoid using the Furnace when there is an enemy Skeleton King on the field. The constant spawning of the Fire Spirits, along with the fact that the Fire Spirits cannot be prevented from being killed, will allow him to accumulate his ability and spawn more Skeletons from it.
    • Conversely, the Furnace works well with the Skeleton King, as it will allow him to easily accumulate his ability to spawn more Skeletons, as well as help him against air troops.
  • The Furnace is affected by Rage, technically allowing it to produce extra waves. However, it will result in only 1 extra wave will be produced with the help of Rage. This is a 2 Elixir investment for an equivalent return value of 1 Elixir, and thus is an ineffective strategy to use.
  • In the Rage mode, all buildings' (including the Furnace's) lifetimes are unaffected, but in Furnace's case, the Troop producing speed is, allowing it to produce up to 8 waves of Fire Spirits instead of the usual 6 in the challenge.


Furnace Attributes

Spawn Speed
Deploy Time
Deploy Time
4 5 sec 1 sec 28 sec Building Rare

Fire Spirit Attributes

Very Fast (120) 2 Air & Ground Ground

Card Statistics

Furnace Hitpoints
Furnace Hitpoints lost per second
Fire Spirit Hitpoints
Fire Spirit Area Damage
Area Damage
3 400 14.2 108 98
4 440 15.7 119 107
5 484 17.2 131 118
6 532 19 144 129
7 584 20.8 158 142
8 640 22.8 173 156
9 704 25.1 190 171
10 772 27.5 209 188
11 848 30.2 230 207
12 932 33.2 252 227
13 1,024 36.5 278 250
14 1,124 40.1 305 274
15 1,236 44.1 334 301

Card Mastery

Type Level/Tier Objective Reward
1 Spawn a total of 660 Troops 100 Furnace cards
50 XP
2 Spawn a total of 1,950 Troops 4,000 Gold
50 XP
3 Spawn a total of 3,250 Troops 150 Gem
50 XP
Damage Dealer
Damage Dealer
1 Deal a total of 240,000 Damage to enemy Troops or buildings with spawned Fire Spirits 6,000 Gold
125 XP
2 Deal a total of 680,000 Damage to enemy Troops or buildings with spawned Fire Spirits 100 Rare Wild Card
125 XP
3 Deal a total of 1,200,000 Damage to enemy Troops or buildings with spawned Fire Spirits 9,000 Gold
125 XP



  • The Furnace card was added to the game on 3/5/2016, in the May 2016 Update.
  • On 18/5/2016, a Balance Update, decreased the Furnace's cost to 4 Elixir (from 5 Elixir), its hitpoints by 14%, and its lifetime to 40 seconds (from 50 seconds). In addition, the Fire Spirits' area radius was increased to 1.5 tiles (from 1.2 tiles).
  • On 21/6/2016, a Balance Update, increased the Furnace's lifetime to 50 seconds (from 40 seconds).


  • On 19/4/2017, a Balance Update, decreased the Furnace's hitpoints by 5%.


  • On 2/7/2018, a Balance Update, increased the Fire Spirits' damage by 5%.
  • On 5/9/2018, the September 2018 Update, changed it so that Rare cards start at Level 3 and end at Level 13 (from 1 to 11).


  • On 5/5/2020, a Balance Update, decreased the Furnace's hitpoints by 16%.
  • On 9/9/2020, a Balance Update, increased the Fire Spirits' area radius to 1.7 tiles (from 1.5 tiles).


  • On 7/6/2021, the Summer 2021 Update, decreased the Furnace's spawn time interval to 7 seconds (from 9.9 seconds), number of Fire Spirits spawned each wave to 1 (from 2), and decreased its lifetime to 49 seconds (from 50 seconds). Its description was updated, previously saying: "The“Furnace spawns two Fire Spirits at a time. It also makes great brick-oven pancakes.". In addition, the Fire Spirits' hitpoints were increased by 109%, their damage by 6%, their range to 2.5 tiles (from 2 tiles), and their area radius to 2.5 tiles (from 1.7 tiles). It also moved the Arena to unlock the Furnace from Spell Valley to Hog Mountain.
  • On 6/9/2021, the 2021 Quarter 3 Update, decreased the Fire Spirits' area radius to 2.3 tiles (from 2.5 tiles).
  • On 27/10/2021, the Champions Update, increased the level cap of all cards to 14 (from 13).
  • On 7/12/2021, the 2021 Quarter 4 Update, decreased the hitpoints of the Furnace by 17%, its lifetime to 33 seconds (from 49 seconds), and its spawn time interval to 6 seconds (from 7 seconds), and made the Furnace spawn 1 additional Fire Spirit upon death. It also decreased the range of the Fire Spirits to 2 tiles (from 2.5 tiles).


  • On 2/8/2022, a Balance Update, decreased the Fire Spirit's damage by 9%.


  • On 4/4/2023, a Balance Update, decreased the Furnace's spawn time interval to 5 seconds (from 6 seconds), and its lifetime to 28 seconds (from 33 seconds),
  • On 19/6/2023, the Card Evolution Update, increased the Level cap of all cards to 15 (from 14).