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Armor Class, often shortened to AC, is a statistic defining a level of protection against damage. Creatures have a natural AC, and certain objects - typically clothing and armor - can enhance a creature's Armor Class, either in part (with a piece of clothing that only covers a part of the body) or in full (across the entire body, without exceptions).
There are seven tiers of Armor Class: C1, C2, A1, A2, A3, A4, A5. They are usually grouped in two categories depending on their prefix: Cx and Ax. Certain types of armor have Variable AC; this concept is explained in its own section below.
Cx Armor Classes
The first two Armor Classes, referred to as unarmored and shortened to Cx, are referred to as such because they offer a level of protection expected of clothing; light, non-armored clothes.
- Little to no reduction of Pain damage.
- C1: As the lowest value, it is the value used to refer to base (Pain) damage. It represents the protection level of naked human skin or comparable light animal hides.
- C2 represents the protection level of heavy clothing or heavier, tougher animal hides, such as a leather jacket.
- No reduction of Limb damage at all.
- Expanding ammunition is more effective, but armor-piercing ammunition is less effective.
Ax Armor Classes
The next five Armor Classes, referred to as armored and shortened to Ax, are referred to as such because they offer a level of protection expected of armor.
- Reduction of Pain damage, roughly proportional to level number.
- A1: Represents a protection rating equivalent to that of super-light, or obsolete body armor, such as an armored tuxedo or a flak jacket.
- A2: Represents a protection rating equivalent to that of light body armor, such as a Light T armor vest.
- A3: Represents a protection rating equivalent to that of medium body armor, such as a Heavy K armor vest.
- A4: Represents a protection rating equivalent to that of heavy body armor, such as an EOD suit.
- A5: Represents a protection rating equivalent to that of super-heavy or advanced body armor.
- Reduction of Limb damage by a number equal to the level number (A3 = LDV -3)
- Armor-piercing ammunition is more effective, but expanding ammunition is less effective.
Certain items in the game; namely types of powered armor, have an AC rating listed as Variable. This means that depending on the charge level of their battery, the level of protection provided will change.
Armor with Variable AC lose 0.1 battery power every time it receives as hit dealing at least 1 limb damage. The armor's current AC level depends on the current amount of battery power.
In order to refill battery power, HITB batteries must be used; each restores 1.0 power, except on the Powered Combat Vest, which only regains 0.5 power per battery.
Variable AC manifests in two ways; as a set AC for human clothing, and as an AC tier modifier for youkai outfits. Youkai outfits have different AC tier modifiers.
|Battery power|| Armor Class
| AC tier modifier|
|3.1 or more||A5||AC tier +7|
|2.1 - 3.0||A4||AC tier +6|
|1.1 - 2.0||A3||AC tier +5|
|0.1 - 1.0||A2||AC tier +4|
|0.0 (no power)||A1||AC tier +3|