The Defense Boost is a feature of some buildings and items to increase the defense value of units defending the city by a certain percentage. The defense boost can also be activated from the Friends Tavern by paying for it with Tavern Silver.
The defense boost only benefits the defending units, offensive units will not be affected. To increase the stats of the offensive units players may use the attack boost.
When having multiple defense boosts, either from buildings or from items, those percentages are stacked. Then the unit's base defense value is increased by the result.
Defense Boost Providers for Defending Army
The following sources increase the defense 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.
| Building |  Fierce Resistance and  Advanced Tactics
| |
|---|---|---|
| Deal Castle | Provides Fierce Resistance Provides  +3% defense boost at level 1 and +30% defense boost at level 10. After level 10 +1% defense boost is gained after every second level.
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| Saint Basil's Cathedral | Provides Fierce Resistance Provides +3% defense boost at level 1 and +30% defense boost at level 10. After level 10 +1% defense boost is gained after every second level.
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| Terracotta Army | Provides Advanced Tactics Provides +2% defense boost at level 1 and +20% defense boost at level 10. After level 10 +1% defense 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 | Defense Boost
| |
|---|---|---|
| The Appleton Cottage | Provides from +10% to +18% defense 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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| Athlete Living Quarters | Provides +7% defense boost. The boost value remains constant through the ages.
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| Classical Garden Pool | Provides +4% defense boost when adjacent to one other different buildings from the Classical Garden Set. The boost values remain constant through the ages.
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| Elephant Fountain | Provides from +3% to +9% defense boost when adjacent to at least three other building from the Indian Fountain Set. The boost value depends on the buildings age.
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| Garden Ruins | Provides +2% defense boost when adjacent to one other different buildings from the Royal Garden Set or +5% defense boost when adjacent to two different buildings from the set. The boost values remain constant through the ages.
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| Monastery | Provides +20% defense boost.
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| Nishikigoi Pond | Provides +2% defense boost when adjacent to two other different buildings from the Cherry Garden Set or +5% defense boost when adjacent to three different buildings from the set. The boost values remain constant through the ages. At level 2 the Nishikigoi Pond provides +5% defense boost when adjacent to two other buildings from the set or +12% defense boost when adjacent to three.
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| Pond of Fall | Provides from +6% to +11% defense boost depending on the buildings age.
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| Ritual Flame | Provides +8% defense boost. The boost value remains constant through the ages.
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| Royal Guard Post | Provides +1% to +2% defense boost depending on the buildings age.
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| Smörgåsbord Feast | Provides +2% defense boost when adjacent to two other different buildings from the Winter Village Set or +5% defense boost when adjacent to three different buildings from the set. The boost values remain constant through the ages.
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| Sundial Spire | Provides from +2% to +7% defense boost depending on the buildings age.
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| Tigers' Den | Provides +5% defense boost. The boost value remains constant through the ages.
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| Watchfire | Provides +4% defense boost at level 1. At level 2 +6% defense boost is provided. The boost values remain constant through the ages.
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| Winter Spire | When upgraded to level 5 or more starts to provides +3% to +14% defense boost depending on the buildings level and the age.
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| Primrose Bloom | Provides +6% defense boost to the defending army.
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Military Buildings
From the Contemporary Era and onward some of the regular military buildings also provide defense boost.
| Building | Boost | Era | |
|---|---|---|---|
| Air Defense Factory | +4%
| Contemporary Era |
| Missile Site | +4%
| Contemporary Era |
| Anti-Materiel Range | +4%
| Tomorrow Era |
| Microwave Blaster Factory | +4%
| Tomorrow Era |
| Satellite Uplink Center | +5%
| Future Era |
| Rail Gun Range | +5%
| Future Era |
| Battle Fortress Factory | +6%
| Arctic Future |
| Plasma Range | +7%
| Arctic Future |
| C.R.A.B. Lab | +6%
| Oceanic Future |
| Turturret Dock | +7%
| Oceanic Future |
| Warrior Monk School | +6%
| Virtual Future |
Items
Defender boost items can be gained from the boost crate, events, Daily Challenges and Incidents. Items can only provide temporary defense boost. The boost effect from the items do stack up, that means players may use multiple boost items at once.
| Item | Defense Boost
| |
|---|---|---|
| Small Defender Boost | Provides +10% defense boost for  8h.
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| Medium Defender Boost | Provides +20% defense boost for 8h.
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| Large Defender Boost | Provides +30% defense boost for 8h.
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Friends Tavern
A temporary defense boost can be activated in the Friends Tavern with Tavern Silver.
| Item |  Cost
| Defense Boost
|
|---|---|---|
| 1,000
| Activates +10% defense boost for 24h.
|
| 2,500
| Activates +20% defense boost for 48h.
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| 7,000
| Activates +30% defense boost for 72h.
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Defense Boost Providers for Attacking Army
The following sources increase the defense 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.
| Building |  Military Boost and Advanced Tactics
| |
|---|---|---|
| Castel del Monte | Provides Military Boost Provides +3% defense boost at level 1 and +30% defense boost at level 10. After level 10 +1% defense boost is gained after every second level.
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| Cathedral of Aachen | Provides Military Boost Provides +3% defense boost at level 1 and +30% defense boost at level 10. After level 10 +1% defense boost is gained after every second level.
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| Statue of Zeus | Provides Military Boost Provides +3% defense boost at level 1 and +30% defense boost at level 10. After level 10 +1% defense boost is gained after every second level.
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| Terracotta Army | Provides Advanced Tactics Provides +2% defense boost at level 1 and +20% defense boost at level 10. After level 10 +1% defense 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 |  Defense Boost
| |
|---|---|---|
| Olympic Treasury | When upgraded to level 10 it provides +10% to +24% defense boost to the attacking army, depending on the buildings age.
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| Sentinel Outpost | Provides from +2% to +4% defense boost to the attacking army, depending on the buildings level.
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| Road to Victory | Provides +5% defense boost to the attacking army when chained to a Statue of Honor.
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| Hippodrome Carceres | Provides +8% - 17% defense boost to the attacking army at level 6, depending on the buildings age.
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| Rousioi Track | Provides +3% defense boost to the Sphendone and Carceres, when chained to those.
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| House of Horrors | Provides +2% - 7% defense boost to the attacking army at level 6 and +6% - 14% at level 7, depending on the buildings age.
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| Ochre Yard | Provides +8% defense boost to the attacking army.
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| Ancient Obelisk | Provides from +2% to +6% defense boost to the attacking army, depending on the buildings level.
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