Arrow tower

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Arrow towers are special addition to combat when hero is trying to capture a garrisoned town. A town can have a primary Arrow tower (when Citadel is built) or one primary and 2 secondary Arrow towers (when Castle is built).

Damage calculation[edit]

Structures[edit]

Arrow tower damage depends on the number of "structures" - buildings built in a town. Not all buildings affect the Arrow tower damage, among them:

Common buildings, which are structures Town Town Specific buildings, which are:
Structures Not structures
Blacksmith, Creature Dwellings, Grail building, Mage Guild, Marketplace, Resource Silo, Tavern, Town Hall Town portrait Castle small.gif Lighthouse, Shipyard, Stables Brotherhood of the Sword, Griffin Bastion
Town portrait Rampart small.gif Mystic Pond, Treasury Fountain of Fortune, Miners' Guild, Dendroid Saplings
Town portrait Tower small.gif Artifact Merchants, Library, Lookout Tower, Wall of Knowledge Sculptor's Wings
Town portrait Inferno small.gif Brimstone Stormclouds, Castle Gate, Order of Fire Birthing Pool, Cages
Town portrait Necropolis small.gif Cover of Darkness, Necromancy Amplifier, Shipyard, Skeleton Transformer Unearthed Graves
Town portrait Dungeon small.gif Artifact Merchants, Battle Scholar Academy, Mana Vortex, Portal of Summoning Mushroom Rings
Town portrait Stronghold small.gif Ballista Yard, Escape Tunnel, Freelancer's Guild, Hall of Valhalla Mess Hall
Town portrait Fortress small.gif Blood Obelisk, Cage of Warlords, Glyphs of Fear, Shipyard Captain's Quarters
Town portrait Conflux small.gif Artifact Merchants, Magic University, Shipyard, Vault of Ashes Horn of the Abyss Garden of Life
Town portrait Cove small.gif Grotto, Shipyard, Thieves' Guild Pub, Roost

Damage[edit]

The damage of the primary Arrow tower is calculated by the formula:

Damage = Base_Damage + d * N

The damage of the secondary Arrow tower is calculated by the formula:

Damage = Base_Damage + d * N/2

where Base_Damage - is the base Arrow tower damage, equal to 10..20 points of damage for the primary and 6..12 points for the secondary Arrow towers; d - additional damage for every structure built, equal to 2..4 points; N - number of structures built. The result of N/2 is rounded down.

As indicated above, different towns have a different number of structures available, therefore, a different maximal Arrow tower damage range.

Town Number of structures Primary Arrow tower damage range Secondary Arrow tower damage range
Town portrait Castle small.gif 17 44..88 22..44
Town portrait Rampart small.gif 16 42..84 22..44
Town portrait Tower small.gif 18 46..92 24..48
Town portrait Inferno small.gif 17 44..88 22..44
Town portrait Necropolis small.gif 18 46..92 24..48
Town portrait Dungeon small.gif 18 46..92 24..48
Town portrait Stronghold small.gif 18 46..92 24..48
Town portrait Fortress small.gif 18 46..92 24..48
Town portrait Conflux small.gif 17 (18 Horn of the Abyss) 44..88 (46..92 Horn of the Abyss) 22..44 (24..48 Horn of the Abyss)
Town portrait Cove small.gif 18 46..92 24..48

The Arrow tower damage cannot be changed by any other damage modificator. The Defense parameter of their targets is always ignored. Despite the right-click tip says that an Arrow tower has 10 Attack, final damage remains unmodified. Archery or the Artillery secondary skills do not affect the damage as well, but a defending hero with Artillery skill is able to control the Arrow towers during a siege. Arrow towers cannot deliver a lucky strike.

The only exception is a bug, which cause the troops under command of a hero with Armorer secondary skill take additional damage from the Arrow tower attack. Troops, which are buffed by Air Shield spell or are petrified take additional damage as well.

Arrow towers under the AI control[edit]

General observation: Arrow towers target the enemy troops depending on their "class". The class is assigned for every enemy troop stack based on their opportunities to deliver damage to the defending troops.

  • Class A - the enemy troop stack can attack immediately when it is its turn to act. Ranged units, that still can shoot, belong here.
  • Class B - enemy troop stack, which can't attack immediately, but can attack its next turn.
  • Class C - enemy troop stack, which can't attack immediately and its next turn, but can attack after.

The AI considers the Arrow tower damage equal to 1 (bug), that is why it prefers to target the stacks with 1 unit in it over the stack of the same units with number, let's say, 10 in it.

There are 2 factors, based on which AI chooses its target. The priority target is calculated separately for each class.

Loss in army power

  • For class A: priority = 1 * (AI Value / hp) * 100%, where 1 is the Arrow tower damage (bug); AI Value - total Value of the stack; hp - total Health of the stack.
  • For class B: priority = 1 * (AI Value / hp) * 50%
  • For class C: priority = 1 * (AI Value / hp) * 33%

Loss in army quantity

  • For class A: priority = 1 / hp * 100%, where 1 is the Arrow tower damage (bug); hp - total Health of the stack.
  • For class B: priority = 1 / hp * 50%
  • For class C: priority = 1 / hp * 33%

After the calculations AI chooses a target with the highest calculated priority. If there are several troops with the equal priority, then the AI will choose a stack, which was placed in the rightmost slot of the hero's army.

Knowing this and considering the fact that the AI prefers to target shooters, it might be a good decision to fill your empty rightmost slots with ranged troops with a single unit in each of them. The other possible way of saving the friendly ranged stacks is to move forward, closer to the primary Arrow tower, a powerful stack of tier 1 troops or a flying stack.

Horn of the Abyss[edit]

Damage calculation was changed to make Arrow towers more dangerous. Their innate 10 Attack points now added together with the defending hero Attack skill and increase damage properly, while still ignoring the target's Defense parameter. Archery now increase the Arrow tower damage as well. The Armorer, Air Shield and Petrification bug has been fixed, so these modificators now properly decrease the Arrow tower damage.