Combat/Installation Type

Abyssal Land Bases, otherwise known as Installations, are enemies representing land-based military fortifications and facilities. While categorized as various different ship classes within the game, they have numerous differences from ordinary ships that grant them unique defensive strengths and weaknesses against shipborne weapons.

General Rules

 * Cannot be attacked by Torpedoes.
 * Note that submarine can attack them during the night regardless of equipment.
 * Torpedo value isn't taken into calculation when attacking them, except during 2013 Fall Event. When targeted, torpedo attacks (during Torpedo Phase or Night Battle) will not activate either.
 * Cannot be attacked by Carriers equipped with Dive Bomber, but Dive Bombers can target them during Opening Air Strikes.
 * Torpedo Bombers CAN attack them during Opening Air Strikes.
 * However, the torpedo stat of Torpedo Bombers is not taken into calculation when attacking Installations.
 * Equipping Type 3 Shell and WG42 (Wurfgerät 42) deals extra damage to Installations.
 * Installation attack power is calculated in the same way as Carrier Type ships.
 * Special damage labels are shown when damaged:
 * All Installation Type Abyssals that carry bombers will not attack during Day Battle when Moderately Damaged, just like Carriers.
 * Installations also activate the second shelling phase, like battleships.
 * Submarines will be forced to attack Installation Type enemies during day battle shelling phase when equipped with certain equipment, such as the WG42.

Types
According to the March 11 2016 Update Patch Notes, there are now different types of Installations, with different characteristics.

Soft-Skinned
Soft-Skinned types refer to normal installations. Unless otherwise specified, most Installations introduced before March 11 2016 should belong to this category.

Notes:
 * Takes 250% damage from Type 3 Shells
 * Takes an additional 75 damage from WG42, with diminishing returns for extras beyond the first.
 * Having Daihatsus equipped grants a bonus against them. (Tested with the Type 89 against Northern Princess).

Pillbox
Pillbox is a new type of Installations introduced via Map 6-4, added in the March 11 2016 update.
 * They takes increased damage from any of the following equipment:
 * If more than one of the following bonus applies, then:
 * If those bonus are from same category, then the highest bonus is selected,
 * If those bonus are from different category, then they are multipled together
 * For instance, if you equip a regular Daihatsu Landing Craft, a Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force) and a Special Type 2 Amphibious Tank onto same DD, then you can get 1.4×2.15×2.4=1.4×(2.326)×(2.8)=7.224×
 * All the bonuses given above are calculated assuming that these are pre-cap bonuses, like the regular Type 3 Shell.

Artillery Imps are currently the only known Pillbox-type Abyssal Installation.

Others
These are Installations that (might) behave differently in regards to damage, and haven't been categorized in the above categories.

Supply Depot Princess

 * Takes significantly more damage from WG42 compared to Soft-Skinned installations.
 * One WG42 gives a 125% post-cap modifier, and multiple WG42s gives a 162% post-cap modifier.
 * This bonus is applied after the additional 75/110 firepower given by WG42 against installations.
 * Additional post-cap bonuses from Crafts:

Isolated Island Princess
Pre-cap bonus: (See Pillbox section for how do these bonus multiplied together)

Central Princess

 * Takes increased damage from dive bombers and seaplane bombers during opening stages.

Central Princess Damaged Form

 * Takes increased damage from WG42 and Type 2 Tanks. However, using both of them together cancels Tank bonus.[4 ]

Harbour Summer Princess Damaged Form
Pre-cap bonus : (See Pillbox section for how do these bonus multiplied together, but effect of having different equipment from same category has not been tested on Harbour Summer Princess Damaged Form yet.)

Ship Type
Despite those enemies are installations, they do have the "ship type" parameter which influence their behavior in battle.

Currently, there are Aviation Battleship, Battleship, and Carrier Installations.


 * Aviation Battleship type: Most Installations belong to this type, firepower calculation same as carriers, shelling attack animation in both day battle and night battle [in browser game version], cannot attack in day battle if heavily damaged.
 * Battleship type: Artillery Imp and Central Princess, firepower calculation same as battleship, shelling attack animation in both day battle and night battle, can attack in day battle even if they are heavily damaged.
 * Carrier type: Lycoris Princess, firepower calculation same as carrier, carrier attack animation in day battle and shelling attack animation in night battle, cannot attack in day battle if heavily damaged. Killing them count toward carrier kill quest.

List of Installation Type Enemies Sorted by Their Description and Appearance
Imp=


 * -|Demon=


 * -|Princess=


 * -|Water Demon=