The Defense Boost is a feature of some buildings and items to increase the defense value of either the defensive units or the attacking units 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 for the attacking army is counted separately from the defending army. In both cases it only benefits the defense value. To increase the offensive stats of the attacking or defending army 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.
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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 for the City Defense when the player is attacked by another player of their neighborhood and when defending against another player in the PvP Arena.
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
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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
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|---|---|---|
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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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Athlon Abbey | Provides from 20% to 30% defense boost on the highest level depending on the buildings age. In addition it also provides an attack boost for the defending army.
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Bear Mountain | Provides from 21% to 35% defense boost depending on the buildings age. In addition it also provides an attack boost for the defending army.
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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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Druid Willow | Provides +3% at level 1 or +6% at level 2 defense boost, when adjacent to at least two other building from the Celtic Forest Set.
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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 +12% defense boost depending on the buildings age.
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Ritual Flame | Provides +8% defense boost at level 1. At level 2 +12% defense boost is provided. 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 | |
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Air Defense Factory | +4%
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Contemporary Era |
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Missile Site | +4%
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Contemporary Era |
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Anti-Materiel Range | +4%
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Tomorrow Era |
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Microwave Blaster Factory | +4%
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Tomorrow Era |
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Satellite Uplink Center | +5%
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Future Era |
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Rail Gun Range | +5%
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Future Era |
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Battle Fortress Factory | +6%
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Arctic Future |
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Plasma Range | +7%
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Arctic Future |
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C.R.A.B. Lab | +6%
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Oceanic Future |
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Turturret Dock | +7%
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Oceanic Future |
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Warrior Monk School | +6%
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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
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|---|---|---|
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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
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Defense Boost
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1,000
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Activates +10% defense boost for 24h.
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2,500
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Activates +20% defense boost for 48h.
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7,000
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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 other players in the PvP Arena, 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
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|---|---|---|
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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
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|---|---|---|
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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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Druid Temple | Provides from +14% to +28% attack boost on the highest level, depending on the buildings age.
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Druid Willow | Provides +3% at level 1 or +6% at level 2 defense boost to the attacking army, when adjacent to at least two other building from the Celtic Forest Set.
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Eagle Mountain | Provides from 19% to 30% defense boost depending on the buildings age. In addition it also provides an attack boost for the attacking army.
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Gate of the Sun God | At level 2 it provides +4% defense boost to the attacking army.
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Hippodrome Carceres | Provides +8% to 18% defense boost to the attacking army at level 6, depending on the buildings age.
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House of Horrors | Provides +2% to 7% defense boost to the attacking army at level 6 and +6% - 15% 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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Olive Grove | Provides +8% defense boost to the attacking army when chained to a Terracotta Vineyard.
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Olympic Treasury | When upgraded to level 10 it provides +10% to +28% defense boost to the attacking army, depending on the buildings age.
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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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Rousioi Track | Provides +3% defense boost to the Sphendone and Carceres, when  chained to those.
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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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Sun Temple | Provides 30% defense boost on the highest level.
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Wonder Wheel | Provides +18% to 32% defense boost to the attacking army, depending on the buildings age.
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