Editing Arrow tower

'''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 (structure)|Castle]] is built).

== Damage calculation ==
=== Structures ===

Arrow tower damage depends on the number of "structures" - buildings built in a town. Not all buildings affect the Arrow tower damage, among them:
*All [[Creature Dwelling]]s, [[Mage Guild]] and [[Town Hall]].
*[[Horde Building]]s.
*[[Citadel]] and [[Castle (structure)|Castle]], since they are [[Fort]] upgrades.
*Few towns have several Specific buildings, which are upgrades of the other buildings (e.g. [[Brotherhood of  the Sword]], [[Fountain of Fortune]]) 

{| cellpadding=0 cellspacing=0 style="background-color:#{{Purple 3}}; border: 1px solid black; text-align:center;"
|- align=center style="background-color:#{{Purple 1}}; color:white; height:25px; border: 2px solid #{{green 1}}"
! width=120 rowspan="2"| Common buildings, which are structures
! width=40 rowspan="2"| Town
! width=150 colspan="2"| Town Specific buildings, which are: 
|-
! width=120 align=center style="background-color:#{{Purple 1}}; color:white; height:25px" | Structures !! width=120 align=center style="background-color:#{{Purple 1}}; color:white; height:25px" | Not structures
|- 
| rowspan="10"| [[Blacksmith]], [[Creature Dwelling]]s, [[Grail building]], [[Mage Guild]], [[Marketplace]], [[Resource Silo]], [[Tavern]], [[Town Hall]] || [[File:Town portrait Castle small.gif|link=Castle|40px]] || [[Lighthouse]], [[Shipyard]], [[Stables]] || [[Brotherhood of the Sword]], [[Griffin Bastion]]
|- style="background-color:#{{Purple 4}}" 
| [[File:Town portrait Rampart small.gif|link=Rampart|40px]] || [[Mystic Pond]], [[Treasury]] || [[Fountain of Fortune]], [[Miners' Guild]],  [[Dendroid Saplings]] 
|-
| [[File:Town portrait Tower small.gif|link=Tower|40px]] || [[Artifact Merchants]], [[Library]], [[Lookout Tower]], [[Wall of Knowledge]] || [[Sculptor's Wings]] 
|- style="background-color:#{{Purple 4}}" 
| [[File:Town portrait Inferno small.gif|link=Inferno|40px]] || [[Brimstone Stormclouds]], [[Castle Gate]], [[Order of Fire]] || [[Birthing Pool]], [[Cages]] 
|- 
| [[File:Town portrait Necropolis small.gif|link=Necropolis|40px]] || [[Cover of Darkness]], [[Necromancy Amplifier]], [[Shipyard]], [[Skeleton Transformer]] || [[Unearthed Graves]]
|- style="background-color:#{{Purple 4}}"
| [[File:Town portrait Dungeon small.gif|link=Dungeon|40px]] || [[Artifact Merchants]], [[Battle Scholar Academy]], [[Mana Vortex]], [[Portal of Summoning]] || [[Mushroom Rings]]
|- 
| [[File:Town portrait Stronghold small.gif|link=Stronghold|40px]] || [[Ballista Yard]], [[Escape Tunnel]], [[Freelancer's Guild]], [[Hall of Valhalla]] || [[Mess Hall]]
|- style="background-color:#{{Purple 4}}"
| [[File:Town portrait Fortress small.gif|link=Fortress|40px]] || [[Blood Obelisk]], [[Cage of Warlords]], [[Glyphs of Fear]], [[Shipyard]] || [[Captain's Quarters]]
|- 
| [[File:Town portrait Conflux small.gif|link=Conflux|40px]] || [[Artifact Merchants]], [[Magic University]], [[Shipyard]], [[Vault of Ashes]]{{-wh}} || [[Garden of Life]] 
|- style="background-color:#{{Yellowish 1}}"
| [[File:Town portrait Cove small.gif|link=Cove|40px]] || [[Grotto]], [[Shipyard]], [[Thieves' Guild (Cove building)|Thieves' Guild]] || [[Pub]], [[Roost]]
|}

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

 <big>''Damage = Base_Damage + d * N''</big>

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

 <big>''Damage = Base_Damage + d * N/2''</big>

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.

{| cellpadding=0 cellspacing=0 style="background-color:#{{Purple 3}}; border: 1px solid black; text-align:center;"
|- align=center style="background-color:#{{Purple 1}}; color:white; height:25px; border: 2px solid #{{green 1}}"
! width=40 | Town
! width=100 | Number of structures
! width=150 | Primary Arrow tower damage range 
! width=150 | Secondary Arrow tower damage range
|- 
| [[File:Town portrait Castle small.gif|link=Castle|40px]] || 17 || 44..88 || 22..44
|- style="background-color:#{{Purple 4}}" 
| [[File:Town portrait Rampart small.gif|link=Rampart|40px]] || 16 || 42..84 || 22..44
|-
| [[File:Town portrait Tower small.gif|link=Tower|40px]] || 18 || 46..92 || 24..48
|- style="background-color:#{{Purple 4}}" 
| [[File:Town portrait Inferno small.gif|link=Inferno|40px]] || 17 || 44..88 || 22..44 
|- 
| [[File:Town portrait Necropolis small.gif|link=Necropolis|40px]] || 18 || 46..92 || 24..48
|- style="background-color:#{{Purple 4}}"
| [[File:Town portrait Dungeon small.gif|link=Dungeon|40px]] || 18 || 46..92 || 24..48
|- 
| [[File:Town portrait Stronghold small.gif|link=Stronghold|40px]] || 18 || 46..92 || 24..48
|- style="background-color:#{{Purple 4}}"
| [[File:Town portrait Fortress small.gif|link=Fortress|40px]] || 18 || 46..92 || 24..48
|- 
| [[File:Town portrait Conflux small.gif|link=Conflux|40px]] || 17 (18{{-wh}}) || 44..88 (46..92{{-wh}}) || 22..44 (24..48{{-wh}})
|- style="background-color:#{{Yellowish 1}}"
| [[File:Town portrait Cove small.gif|link=Cove|40px]] || 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 [[Luck|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 [[Petrify|petrified]] take additional damage as well.

== Arrow towers under the AI control ==
'''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'''
*<big>''For class A: priority = 1 * ([[AI Value]] / hp) * 100%''</big>, where 1 is the Arrow tower damage (bug); AI Value - total Value of the stack; hp - total [[Health]] of the stack.
*<big>''For class B: priority = 1 * (AI Value / hp) * 50%''</big>
*<big>''For class C: priority = 1 * (AI Value / hp) * 33%''</big>

'''Loss in army quantity'''
*<big>''For class A: priority = 1 / hp * 100%''</big>, where 1 is the Arrow tower damage (bug); hp - total Health of the stack.
*<big>''For class B: priority = 1 / hp * 50%''</big>
*<big>''For class C: priority = 1 / hp * 33%''</big>

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. 

== {{hota}} ==
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.

[[Category: Combat]]

__NOTOC__