Combat/Anti-Installation

Installations are an enemy-type representing "land-based installations", and are characterized by high armor and high HP. They are difficult to handle using normal anti-ship setups and require specific setups in order to be destroyed. Installations are typically found as bosses or as boss escorts.

General Characteristics

• Installations cannot perform or benefit from flagship protection.
• They have different damage statuses instead of the normal ones used for ships.
  • These statuses are merely cosmetic in nature and have no gameplay difference.

Ship Damage Label	Installation Damage Label
Lightly Damaged (小破)	Confused (混乱)
Moderately Damaged (中破)	Damaged (損害)
Heavily Damaged (大破)	Broken (損壊)
Sunk (撃沈)	Destroyed (破壊)

Installation Classification

Installations are classified by two categories: Ship Type (BB, BBV, CV) and Toughness (Soft Skin or Hard Skin).

Ship Type

Type	Characteristics
Battleship (BB)	Examples are Artillery Imps and Central Princess. Uses the surface shelling formula for calculating damage. Uses the shelling attack animation in day and night battle. Can continue attacking when moderately damaged.
Aviation Battleship (BBV)	Most installations fall under this category. Uses the carrier attack formula for calculating damage. Uses the shelling attack animation in day and night battle. Cannot attack during the day if moderately damaged or if there are no planes left. Forced to attack submarines if they have equipment with Anti-Submarine stat.
Carrier (CV)	Example is Lycoris Princess. Uses the carrier attack formula for calculating damage. Uses the carrier attack animation in day battle and the shelling animation at night. Cannot attack during the day if moderately damaged or if there are no planes left. Do not enable the 2nd shelling phase if there is no battleship present.

Skin Toughness

Type	Characteristics
Soft Skin	Examples are Supply Depot Princess, Harbour Princess and Northern Princess. Takes a lot of damage from AA Shells and less from other Anti-Installation equipment. This weakness allows battleships and heavy cruisers to easily deal with these installation types. Still takes a decent amount of damage from other anti-installation equipment. Supply Depot Princess has extra Post-Cap modifiers.
Hard Skin	Examples are Isolated Island Demon, Artillery Imp, and Harbour Summer Princess. Takes more damage from Anti-Installation equipment like Landing Crafts, Amphibious Tanks and Anti-ground Artillery

• Please note that event-only installation might not be in one of these categories.

Installations Glossary

Here is a list of all "Installation type Abyssals" ever encountered in the game.

• Here are listed the base forms of those installations, most coming in many variations often depending on the map difficulty, the map state (last-dance), and the event itself (most events bringing new variations).
  • Some installation sub-forms of interestest are still listed, those forms having special variations like a different type than the main form, of some special abilities.
• Note that some toughness characterization may be erroneous, since most of those installations were introduced before this system was defined.

Installations Glossary
Type	Hard	Soft	Soft (Supply Depot)
BB	6-4
BBV	Not Torpedo Immune	3-54-3 & 4-5	6-4
CV	6-4
DD

Attack Behavior

The targeting of installation follow some special rules.

Suport Expedition

• Shelling Support expedition can attack Instllation.
• It's unknown if torpedo support and ASW support will target installaion or not.

Air strike

• Normal dive bombers can not attack installations during the air strike phase.
• Only Anti-installation Dive Bombers can target installation.
• It's unknown if ASW plane will prioritize Submarine or installation.

Dive-Bombers that can attack installations
Carriers will only attack installations in the shelling phase if equipped with Torpedo Bombers or Anti-Installation Dive Bombers. Additionally, carriers will attack installations if equipped with non-special dive bombers AND one of the special dive bombers below. Any other dive bomber will completely disable shelling against installations even if the carrier has a torpedo bomber equipped. This can be very useful to manipulate the targeting mechanic so the carriers attack important targets.
Ju 87C Kai Prototype Nanzan F4U-1D FM-2 Ju 87C Kai Ni (w/ KMX) Ju 87C Kai Ni (w/ KMX/Skilled) Suisei Model 12 (634 Air Group w/ Type 3 Cluster Bombs) AAR Suisei Model 12 (w/ Type 31 Photoelectric Fuze Bombs) AAR Type 99 Dive Bomber Model 22 Type 99 Dive Bomber Model 22 (Skilled) SB2C-3 SB2C-5 F4U-4 AAR

Shelling

• Submarines can attack installations during shelling if equipped with a Special Type 2 Amphibious Tank.
  • They will only target instllations during the shelling phases.
  • They will be able to attack installations at night regardless of equipment.
  • Their low firepower makes them poor anti-installation ships.
• Carriers are unable to perform CVCI on installations, even if equipped with anti-installation dive bombers.
• Ise and Hyuuga can perform the suisei-CI against installation with any Dive Bomber.
• Special Attacks behave like normal against installation.

Torpedo

• Both opening and closing torpedoes can not target installations.
  • Opening and closing torpedoes will fail to trigger if only installation targets remain.

Night Battle

• The torpedo stat is ignored when calculating night battle damage against installations. Please see Night Battle for more details.
  • This makes destroyers, light cruisers, and heavy cruisers much weaker unless equipped with anti-installation equipment.
• When targeting installation the Cut-in choice will ignore any equiped torpedo.
  • Except Special DD Cut-in that include a main gun (torpedo stat is still considered equal to 0).
• Night shelling Carrier Attacks will deal damage like they would to ships.
  • This include Ark Royal's night swordfish attack.
• Air night attacks ignore all anti-installation bonus
  • The attack can target installations even if no anti-anstallation dive bombers is equiped

Damage Calculation

• During day, damage is capped at 220 so any ship with a proper anti-installation setup will be able to hit the cap.
  • When facing hard-skinned installations, it is better for battleships to have AP shells instead of Type 3 because they will hit the day cap anyway.
• Anti-installation is very important during night battle when the cap is raised to 360.
• Torpedo stat is always counted as 0 when attacking installations. This applies to both airstrikes and night battles.
  • However improvements that provide damage during Night Battle is taken into account during such.
• Supply Depot Princess is the only known installation that takes post-cap damage from anti-installation equipment.
  • This makes her vulnerable to getting one shot by nuke setups. See below for details.
• While dive bombers have a post-cap bonus during the air-strike, the low base damage means it is of limited effectiveness against high armor installations.
• The Armor Piercing modifier (post-cap) is effective against installation.

Calculation

Installations generally have a lot of HP and/or armor. But multiple different cumulative bonuses exist against them, allowing for massive damage when using the right set-ups. These bonuses are divided into 5 groups and are calculated in the following order:

1. Ship type bonuses
2. General multiplicative bonuses
3. Specific equipment bonuses:
   1. 11th regiment bonuses
   2. M4A1 bonuses
   3. Ho-Ni bonuses
   4. Landing craft synergy bonuses
4. General Flat bonuses
5. Post-cap bonuses against Supply Depot Princess

• The order of bonuses is still being researched so it might change in the future

Pre-cap Shelling:

• [math]\displaystyle{ \text{Atk}_\text{pre-cap} = \Big( \big[ \big( [ ( \text{Atk}_\text{base} {\color{tomato} \times \text{A0}} {\color{DeepSkyBlue} + \text{B0}} ) {\color{tomato} \times \text{A1}} {\color{DeepSkyBlue}} ] {\color{tomato} \times \text{A21}} {\color{DeepSkyBlue} + \text{B21}} \big) {\color{tomato} \times \text{A22}} {\color{DeepSkyBlue} + \text{B22}} \big] {\color{tomato} \times \text{A23}} {\color{DeepSkyBlue} + \text{B23}} \Big) {\color{tomato} \times \text{A24}} {\color{DeepSkyBlue} + \text{B24} + \text{B1}} }[/math]

Pre-cap Carrier Shelling:

• [math]\displaystyle{ \text{Atk}_\text{pre-cap} = \Big[ \Big( \big[ \big( [ \text{Atk}_\text{base} {\color{tomato} \times \text{A1}} ] {\color{tomato} \times \text{A21}} {\color{DeepSkyBlue} + \text{B21}} \big) {\color{tomato} \times \text{A22}} {\color{DeepSkyBlue} + \text{B22}} \big] {\color{tomato} \times \text{A23}} {\color{DeepSkyBlue} + \text{B23}} \Big) {\color{tomato} \times \text{A24}} {\color{DeepSkyBlue} + \text{B24} + \text{B1}} +(\text{DB} \times 1.3) + 15 \Big] \times 1.5 +25 }[/math]

Cap

• [math]\displaystyle{ \text{Atk}_\text{cap} = \text{Cap} \times \sqrt{\text{Atk}_\text{pre-cap} - \text{Cap}} }[/math]

Post-cap:

• [math]\displaystyle{ \text{Atk}_\text{post-cap} = \text{Atk}_\text{cap} {\color{tomato} \times \text{C}} }[/math]

With:

• [math]\displaystyle{ \text{Atk}_\text{base} }[/math] the base attack deffined here,
• A & C the Multiplicative bonuses,
• B the Flat bonuses,
• A & B being pre-cap bonuses,
• C being post-cap bonuses.
• [math]\displaystyle{ \text{DB} }[/math] being the bombing stat of Anti-installation Dive Bomber only
• [math]\displaystyle{ \text{Cap} }[/math] is:
  • 220 during day,
  • 360 during night.

Bonuses

Ship type bonuses

	Ship type	Target	Bonuses
A0	DD/CL	Artillery Imp	x1.4
B0	SS/SSV	Any installation	+30

General multiplicative bonuses

These bonuses depend on the enemy targeted, as well as the equipment used.

A1
Installation Type		Soft-Skinned
Number Equipped		Single	Multiple	Single	Multiple	Single	Multiple	Single	Multiple
	AA Shells	2.5		1.75/1.7?				1.75
	AP Shells					1.85		1.3
	WG42 (Wurfgerät 42)	1.3	1.82	1.4	2.1	1.6	2.72	1.4	1.68
	Anti-Ground Rocket Launcher	1.25	1.875	1.3/1.5?	2.145	1.5	2.7	1.25	1.75
	ASW Mortars	1.2	1.56	1.2	1.68	1.3	1.95	1.1	1.265
Landing Craft Type Multiplier		1.4		1.8		1.8		1.7
Landing Craft Improvement Multiplier		1 + (Average /50) ( 1.2x)
	Toku Daihatsu Landing Craft	1.15		1.15		1.15		1.2
	DLC + T89 tank Toku DLC + Ho-Ni tank	1.5	1.95	1.2	1.68	1.5	2.1	1.6	2.4
	DLC + Panzer	1.5		1.2		1.5		1.6
	Toku DLC + 11th Reg
	M4A1 DD	1.1		1.8		2.0		2.0
	Armed Daihatsu Soukoutei ☀ Day Only	1.1	1.21	1.3	1.43	1.3	1.56	?
	Ka-Mi tank	1.5	1.8	2.4	3.24	2.4	3.24	2.8	4.2
Amphibious Tank Improvement Multiplier		1 + (Average /30) ( 1.33x)
	Anti-Installation Dive Bombers			1.4	2.45	1.5	3.0	1.3
	Seaplane Bombers/Fighters	1.2				1.5		1.3

Notes

• The Improvement Bonus takes the average for all Landing Crafts equipped on the ship.
• The Improvement Bonus takes the average for all Amphibious Tanks equipped on the ship.
• The developers have mentioned that Rations
  
  consumed by a girl "affect landing crafts' morale".

Specific equipment bonuses

The following multipliers are pre-cap.

Equipment			Multiplicative bonus	Flat Bonus
Toku DLC Tank Bonus			A21	B21
Toku DLC + 11th Reg Toku DLC + Ho-Ni tank			1.8	25
Sherman Bonus			A22	B22
M4A1 DD			1.4	35
Ho-Ni Tank Regiment Bonus			A23	B23
Toku DLC + Ho-Ni tank			1.3	42
DLC Synergy Bonus			A24	B24
Armed Daihatsu Soukoutei	Group 1	Group 2	Multiplicative bonus	Flat Bonus
Only one	1 of Any		1.2	10
Both	1	0	1.32	12
	0	1	1.44	13
	2 of any		1.56	15

Flat Damage Bonuses

B1
Amount Equipped		1	2	3	4
	WG42	75	110	140	160
	Anti-Ground Rocket Launcher	55	115	160	190
	Anti-Ground Rocket Launcher CD	80	170	230	260
	ASW Mortar	30	55	75	90
	ASW Mortar CD	60	110	150	180

Post-Cap Bonus

Supply Depot Princess is currently the only installation to have a post-cap bonus for shelling. These bonuses are applied after the soft damage cap.

• Supply Depot Princess is a soft-skinned installation for purposes of Pre-Cap Bonuses.

C
Installation Type
Number Equipped		Single	Multiple
	WG42	1.25	1.625
	Anti-Ground Rocket Launcher	1.2	1.68
	ASW Mortars	1.15	1.38
	Landing Craft Type Multiplier	1.7
Landing Craft Improvement Multiplier		[1 + (Average /50)] N Any Landing Craft: 1 Landing Craft + Ho-Ni: 2 DLC (Panzer II/NA): 3
	Toku Daihatsu Landing Craft	1.2
	DLC + T89 tank Toku DLC + Ho-Ni tank	1.3	2.08
	DLC + Panzer	1.3
	Toku DLC + 11th Reg
	M4A1 DD	1.2
	Armed Daihatsu Soukoutei	1.5	1.65
	Ka-Mi tank	1.7	2.55
Amphibious Tank Improvement Multiplier		1 + (Average /30) ( 1.33x)

Landing Craft Improvement Modifier

• Unlike other Landing Crafts, the Toku DLC + Ho-Ni tank and DLC + Panzer have the special property of reapplying the Landing Craft Improvement Multiplier again during damage calculations:
  • Twice for the Ho-Ni,
  • Three times for the Panzer.
• As neither equipment are currently improvable, they lower the average improvement multiplier, but compensate through this unique property.
• Assuming two landing crafts are equipped, one being the Ho-Ni/Panzer and the other being , the improvement bonus is:
  • 1.21x when the Ho-Ni is equipped,
  • 1.331x when the Panzer is equipped.

Land Base Bonus

For the damage formula, please refer to the LBAS page. The bonuses work for all bombers on the land base (except maybe jets).

Installation Targeted
Pre-cap	Multiplicative	[math]\displaystyle{ {\color{tomato}\text{Mod}_\text{AIpre}} }[/math]		-
		1.18	1.6	-
Post-cap		[math]\displaystyle{ {\color{tomato}\text{Mod}_\text{AIpost3}} }[/math]		[math]\displaystyle{ {\color{tomato}\text{Mod}_\text{AIpost1}} }[/math]
		1.7	1.55	2.1
	Flat	-		[math]\displaystyle{ {\color{DeepSkyBlue}\text{Mod}_\text{AIpost2}} }[/math]
		-	-	100

Air Strike

We are currently lacking information on how modifiers affect opening air-strikes.

Equipment Setups

Below are recommended equipment setups for anti-installation purposes. The equipment order is illustrative and does not reasonably matter.

As a general rule:

• Regarding :
  • If a ship's base firepower is low, it can be viable to use Anti-Ground Rockets to provide a large flat damage increase to supplement the ship's anti-installation damage.
  • Depending on whether one or more Anti-Ground Artilleries are to be equipped on a ship, it is recommended to use a WG42 for singular purposes, or Shipborne Model Type 4 20cm Anti-ground Rocket Launchers (or CD) if multiple are needed.
  • ASW Mortar
    are inferior substitutes to regular Anti-Ground Artilleries when lacking those.
• Regarding and :
  • These provide a high damage multiplier against Installations. Some specialized variants also provide an additional flat damage increase that is multiplicative with certain modifiers.
  • As Landing Crafts and Amphibious Tanks have separate multipliers, it is recommended to use them in tandem to maximize the effect.

Nuke Setup describes any setups using anti-installation equipment from multiple categories to multiplicatively amplify damage dealt to Installations.

• Such a setup has a strong anti-installation power against all installations but is hampered by the daytime damage cap.
• Nuke Setups are recommended to be used when dealing with Supply Depot Princess in particular, utilizing the high post-cap side of the bonuses to deal with her generally high HP pool.
• The setup's damage can be further improved by using multiple copies of those types of equipment where applicable.
  • For example, equipping multiple Tank or a Landing Crafts with unique bonuses instead of anti-ground rockets provides better damage output for the ship, however it's advised to only do so if you have enough available for the other ships in your fleet that require them.

All "surface" anti-installation setups can be further enhanced by using them in Special Attacks, especially Nelson's Touch.

Equipment Setup	Notes
BB/FBB/BBV
	The basic battleship setup. Because Battleships are not far away from the damage cap compared to other ship types, they do not benefit much from the high pre-cap multipliers that anti-installation equipment provide. The standard artillery spotting setup will allow them to utilize spotting attacks and AP Shell's post-cap bonuses against the installation, as well as be effective against all other targets in the enemy fleet.
	This is an option when facing soft-skinned installations. Taking an AA shell will slightly improve their damage versus installations, but will also limit the battleship's effectiveness against all other targets by reducing their artillery spotting attack types.
	Yamato-class Kai Ni & Ise-class Kai Ni only. "Best of both worlds" for 5-slot battleships.
	Nagato-class Kai Ni & Yamato Kai Ni Juu only. The landing craft/amphibious tank will make their Special Attacks deal significantly more damage to installation enemies. Keeping the seaplane allows to still perform artillery spotting to maintain enough effectiveness against other targets.
+ or +	Nuke Setup , Yamato Kai Ni Juu only. A proper nuke setup keeping the Double Attack and artillery spotting, that uses Yamato's ability to carry Secondary Guns in her RE, also taking advantage of her Special Attack. An AP Shell may be used to replace the anti-ground rockets to improve performance against other targets, while improving the damage multiplier of Yamato's Special Attacks and Artillery Spotting types.
CA/CAV
	The standard anti-installation setup for heavy cruisers. It allows artillery spotting and deals decent damage against installations.
or +	This is an alternative setup only for aviation cruisers. It removes the ability to artillery spot for much more powerful anti-installation damage at night. For Mogami-class Cruisers with a Reinforcement Expansion, an option to equip 8cm High Angle Guns in the expansion slot in order to retain a weaker variant of artillery spotting is a viable alternative.
+	Nuke Setup , Mogami Kai Ni Toku only. The last setup uses Mogami's ability to carry 8cm High-angle Guns in her RE, making this a true nuke setup while keeping the Double Attack.
CL
	Nuke Setup
	A setup for 4-slot light cruisers. This preserves their ability to double attack at night while giving them significant anti-installation power.
DD
	Nuke Setup
	Mini-Nuke Setup Substitute nuke setups to use ONLY when lacking Landing Craft or Amphibious Tanks.
	Setups that keep the Double Attack while maintaining decent anti-installation power, allowing reasonable effectiveness against installation and other targets at night.
	Tashkent only. Functions much like the light cruiser setup with a powerful night battle double attack.
CV/CVB/CVL
	This is only to be used when having anti-installation dive bombers. It will allow the carrier to still perform CVCI against other targets.
	The numbers of torpedo bombers and fighters in this setup can be varied depending on the amount of fighter power required. This is the standard carrier anti-installation setup. While it does sacrifice CVCI, the carrier shelling formula, and proficiency bonuses, it still ensures that carriers will do significant damage to installations and other targets.
	Gambier Bay Mk.II & Unyou Kai/Ni only. The closest setup to a proper "CV nuke".
AV
	Nuke Setup 4-slot AVs can also either take a 2nd anti-ground rocket, a midget sub, or a seaplane fighter in their last slot.
LHA
	Nuke Setup LHAs can carry some of the strongest 4 slots nuke configurations.
+	Mega-Nuke Setup , Shinshuu Maru Kai only. Uses Shinshuu Maru's unique ability to carry a Soukoutei (Armored Boat Class) in her RE to further improve the LHA setup. The other Landing Craft should be the Armed Daihatsu for optimum effectiveness.

Additional Information

Landing Craft/Amphibious Tank Capable Ships

Ships that can equip Landing Craft / Amphibious Vehicles
Type	Landing Craft		Both &		Amphibious Vehicle
DD			Kai Ni D Kai Ni D Kai Ni D Kai Ni D		Kai Ni
CL		Kai Ni D Kai Ni Toku
CAV		Kai Ni Toku
(F)BB(V)		Kai Ni Juu	Kai Ni C
CVL		Kai Ni Sen
AV		Kai Ni Toku
AO
LHA
SS(V)			All
RE	Soukoutei (Armored Boat Class): Shinshuu Maru Ka-Tsu tanks : I-36  · I-41  · I-47 Kai · I-58 Kai
[edit]

See Also

• Abyssal Land Bases List