When you make an attack roll, you're rolling to meet or beat your character's THAC0 score. The target's Armor Class is subtracted from that target number, e. I believe there are also AC for different attacks, e. Coldhands View Profile View Posts. Originally posted by Aldrodamus :.
Originally posted by levelworm :. Originally posted by Coldhands :. AC 0 is a warrior in typical armor, strong metal maybe lightly enchanted. This is around the default for a new front line character who bought gear with starter money. The super etc stuff was later.
If their ac is -5, 10 - -5 is 15 to hit. Small numbers and simple math was the original concept here. The hit roll is a 20 sided die. Plate armor. Full plate armor. Armor Class Modification. Thieving ability. No armor. Elven chain. Various leather armors. Pick pockets. Open locks. Move silent.
Hide in shadows. The defender's AC before any bonuses or penalties have been applied. By default this value is 10 for non- Monk player characters, but many creatures are nimble, have thick skin or even a shell, granting them a lower "natural" default. This value can't be higher than When several sources set Base AC to different values, the best value wins.
The sum of all damage-agnostic AC modifiers currently affecting the defender — they work against all weapons. For example, Helm of the Noble provides such a modifier, but not Destroyer of the Hills. Dexterity and Single-weapon style modifiers are counted separately. Ability Bonuses AC bonus from the Single-Weapon fighting-style proficiency, active when the defender is wielding a one-handed melee weapon with an empty off-hand. It can be a -1 or a -2 bonus. The defender's Final AC is altered by such a modifier only against weapons that deal the relevant damage type.
For example Full Plate Armor , on its own, provides a total AC of 1 against weapons that deal Crushing damage — since it doesn't provide extra AC vs Crushing — but of -3 vs Slashing damage — thanks to its large -4 bonus vs Slashing. Appears as: Armor Class Modifiers Crushing It can be a -2 or -4 bonus vs Missile damage.
A defender that benefits from the Improved type of Invisibility effect — as granted by e. Attacks from creatures able to see the invisible are exempted from this penalty.
A defender protected from certain types of opponents — thanks to e. A defender not wielding a weapon Monk excepted or wielding a ranged weapon will grant a -4 THAC0 bonus to all melee attacks against them. Amulet of the Master Harper. Cloak of the Dark Moon. DEX 24 with Potions. Total AC displayed in the Inventory screen's shield icon. Slashing -specific AC modifiers. Golden Girdle of Urnst.
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