The Attack Boost is a feature of some buildings and items to increase the attack value of attacking units by a certain percentage. The attack boost can also be activated in the Friends Tavern by paying for it with Tavern Silver.
The attack boost only benefits the attacking units, units defending the city will not be affected. To increase the stats of the defending units players may use the defense boost.
When having multiple attack boosts, either from buildings or from items, those percentages are stacked. Then the unit's base attack value is increased by the result.
Attack Boost Providers for Attacking Army
The following sources increase the attack values of the players troops when they are used for attacking. This applies for attacking other players in the neighborhood, for attacking in the guild expedition encounters, for attacking on the GvG Maps, for fights on the Continent Maps, for fights in the Daily Challenges or for fights in the Guild Battlegrounds.
Great Buildings
Some of the Great Buildings offer a Military Boost or Advanced Tactics bonus, which beside increasing the attack value also increases the defense value of the attacking units. Great Buildings are the only option to boost the defense value of the attacking units.
| Building |  Military Boost and  Advanced Tactics
| |
|---|---|---|
| Castel del Monte | Provides Military Boost Provides  +3% attack boost at level 1 and +30% attack boost at level 10. After level 10 +1% attack boost is gained after every second level.
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| Cathedral of Aachen | Provides Military Boost Provides +3% attack boost at level 1 and +30% attack boost at level 10. After level 10 +1% attack boost is gained after every second level.
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| Statue of Zeus | Provides Military Boost Provides +3% attack boost at level 1 and +30% attack boost at level 10. After level 10 +1% attack boost is gained after every second level.
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| Terracotta Army | Provides Advanced Tactics Provides +2% attack boost at level 1 and +20% attack boost at level 10. After level 10 +1% attack boost is gained after every second level. What makes the Terracotta Army different is that the stats of the defending army are also increased by the same amount.
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Special Buildings
| Building | Attack Boost
| |
|---|---|---|
| Altar of Artemis | Provides from +3% to +7% attack boost depending on the buildings age. Altar of Artemis is one of the six options when reaching level 5 with the Altar Garden.
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| The Appleton Cottage | Provides from +5% to +13% attack boost depending on the buildings age. The Appleton Cottage is one of the three options when reaching level 7 with the September Cottage.
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| Botanical Rotunda | Provides from +5% to +10% attack boost depending on the buildings age.
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| Carousel | Provides from +4% to +8% attack boost depending on the buildings age. In addition to attack boost the Carousel also provides the same amount of defense boost.
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| Checkmate Square | Provides from 5% to +10% attack boost depending on the buildings age.
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| Classical Garden Pool | Provides +5% attack boost when adjacent to two other different buildings from the Classical Garden Set. The boost values remain constant through the ages.
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| Colossus | Starts providing attack boost when upgraded to level 4 or more. Gives from 3% to +15% attack boost depending on the buildings level and the age.
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| Contestants' Estate | Provides +3% attack boost. The boost values remain constant through the ages.
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| Drummer School | Provides +4% attack boost. The boost value remains constant through the ages.
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| Elephant Fountain | Provides from +2% to +9% attack boost when adjacent to at least four other building from the  Indian Fountain Set. The boost value depends on the buildings age.
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| Fire Pagoda | Provides from +6% to +12% attack boost depending on the buildings age. The Fire Pagoda is one of the three options when upgrading the Pagoda to level 7.
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| Greater Runestone | Provides from +2% attack boost when upgraded to level 4 or more. The boost value remains constant through the ages.
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| Halmbock | Provides +1% attack boost when adjacent to two other different buildings from the  Winter Village Set or +3% attack boost when adjacent to three different buildings from the set. The boost values remain constant through the ages.
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| Piazza Clock Tower | At level 1 provides from +2% to +7% attack boost when adjacent to three other different buildings from the Piazza Set. The boost values depends on the buildings age. At level 2 +4% to +9% attack boost is provided.
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| Royal Marble Gateway | Provides from +2% to +7% attack boost depending on the buildings age.
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| Pirate Guard Post | Provides from +1% to +2% attack boost depending on the buildings age.
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| Sakura Rock | Provides +2% attack boost when adjacent to two other different buildings from the  Cherry Garden Set or +5% attack boost when adjacent to three different buildings from the set. The boost values remain constant through the ages.At level 2 the Sakura Rock provides +4% attack boost when adjacent to two other buildings from the set or +10% attack boost when adjacent to three.
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| Speaker's Corner | Provides from +5% to +10% attack boost depending on the buildings age.
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| The Pirate Ship | Provides +8% attack boost. The boost value remains constant through the ages. The Pirate Ship is one of the three options when upgrading The Ship to level 7.
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| Winners' Plaza | Provides from +2% to +6% attack boost depending on the buildings age.
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| Yggdrasil | Provides from +6% to +30% attack boost depending on the buildings level. On the same level the boost value remains constant through the ages.
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| Abandoned Asylum | Provides from +16% to +24% attack boost on the highest level, depending on the buildings age.
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Military Buildings
From the Contemporary Era and onward some of the regular military buildings also provide attack boost.
| Building | Boost | Era | |
|---|---|---|---|
| Attack Helicopter Base | +4%
| Contemporary Era |
| Strike Team Center | +4%
| Contemporary Era |
| Stealth Tank Factory | +4%
| Tomorrow Era |
| Ultra AP Factory | +4%
| Tomorrow Era |
| Exoskeleton Factory | +5%
| Future Era |
| Hover Tank Base | +5%
| Future Era |
| Behemoth Hangar | +6%
| Arctic Future |
| Dragon Drone Base | +7%
| Arctic Future |
| Manta Bay | +7%
| Oceanic Future |
| Nautilus Drop | +7%
| Oceanic Future |
| Hidden School | +8%
| Virtual Future |
| Rocket Range | +8%
| Virtual Future |
Items
Attacker boost items can be gained from the boost crate, events, Daily Challenges and Incidents. Items can only provide a temporary attack boost.
Attacker boosts can only be used one at a time. When choosing a second item, the player will be asked if they want to replace the acitvated item with the second one.
| Item | Attack Boost
| |
|---|---|---|
| Small Attacker Boost | Provides +5% attack boost for  8h.
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| Medium Attacker Boost | Provides +10% attack boost for 8h.
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| Large Attacker Boost | Provides +20% attack boost for 8h.
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Friends Tavern
A temporary attack boost can be activated in the Friends Tavern with Tavern Silver.
| Item |  Cost
| Attack Boost
|
|---|---|---|
| 750
| Activates +10% attack boost for 30m.
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| 3,000
| Activates +20% attack boost for 4h.
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| 8,500
| Activates +30% attack boost for 24h.
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Attack Boost Providers for Defending Army
The following sources increase the attack values of the players troops when they are used for defending. This applies only for the City Defense when the player is attacked by another player of their neighborhood.
Great Buildings
Some of the Great Buildings offer a Fierce Resistance or Advanced Tactics bonus, which beside increasing the defense value also increases the attack value of the defending units. Great Buildings are the only option to boost the attack value of the defending units.
| Building |  Fierce Resistance and Advanced Tactics
| |
|---|---|---|
| Deal Castle | Provides Fierce Resistance Provides +3% attack boost at level 1 and +30% attack boost at level 10. After level 10 +1% attack boost is gained after every second level.
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| Saint Basil's Cathedral | Provides Fierce Resistance Provides +3% attack boost at level 1 and +30% attack boost at level 10. After level 10 +1% attack boost is gained after every second level.
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| Terracotta Army | Provides Advanced Tactics Provides +2% attack boost at level 1 and +20% attack boost at level 10. After level 10 +1% attack boost is gained after every second level. What makes the Terracotta Army different is that the stats of the offensive army are also increased by the same amount.
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Special Buildings
| Building |  Attack Boost
| |
|---|---|---|
| Tactician's Tower | Provides from +2% to +4% attack boost depending on the buildings level.
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| Mikoto Bridge | Provides from +12% to +22% attack boost depending on the buildings level.
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