The D&D mechanical abstraction of how difficult it is to hit and cause damage to an opponent.

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In what situations would a target be denied a Dex bonus to AC?

I have an encounter coming up where my PCs will face a high level rogue. Naturally, I'd like to use his sneak attack ability, but I've never played a rogue before so I'm light on experience. From the ...
15
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9answers
10k views

Is AC really as powerful as I think it is?

My understanding of AC is that an enemy must roll higher than your AC to take any damage on you. However, if this is the case, wouldn't a player only need an AC higher than 20 to be invincible? I am ...
15
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3answers
1k views

Are there advantages to descending AC?

From a game design standpoint, are there any advantages to descending AC? I've tagged this D&D because I think this was the most popular game which required a low AC all the way to the year 2000 ...
14
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3answers
5k views

Combining various AC-providing clothing and armor

Are there any rules for combining different clothing/armor for providing AC? For example, can an adventurer wear full plate and bracers and get the AC bonus from both? Can an adventurer wear a Cloak ...
12
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5answers
14k views

How do you calculate THAC0?

So, I get what THAC0 stands for (To Hit Armour Class 0) but it's not something I ever used when playing way back when - we just pored over the to hit tables all the time, manually worked out ...
12
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2answers
3k views

How does __(Dexterity) vs. AC work?

I'm working through the new Red Box, and have ended up with a character with the at-will Bump And Run power. The attack is listed as __ (Dexterity) vs. AC ...
11
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2answers
2k views

How to improve AC when it's so low that enemies hit on 3–5?

The AC of my character is falling far behind her other defenses, and I'm wondering if I have missed out on something basic and important. I am going to post some of her stats as an example to this ...
11
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3answers
43k views

What exactly is “base AC”?

The phrase "base AC" appears in the D&D 5E basic rules exactly once, in the description of the Mage Armor spell. This says: The target’s base AC becomes 13 + its Dexterity modifier. But ...
11
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1answer
2k views

Does Mage Armor stack with Shield?

Mage Armor sets the target's base AC to 13+Dex. Shield gives you a +5 bonus to AC. If you cast both on yourself, does that give you an effective AC of 18+Dex while both spells are in effect?
10
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2answers
2k views

Does an Enhancement bonus on clothing become an Armor bonus?

Given this discussion I had here about combining Magic Vestment and Coat of Many Stars: Targeting what you're wearing would get you two different, non-stacking sources of Armor bonus. – Zachiel ...
9
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3answers
1k views

How does the AC evolve with high levels?

I am currently DMing a group with an average level of 10. This is my first experience as DM so I have never mastered high levels. Current ACs are reasonably high at the moment (22 for the Paladin with ...
8
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2answers
1k views

Would the AC from a Sorcerer's Draconic Resistance combine with a Monk's Unarmoured Defence?

Reading from the Player's Handbook. If you pick a Sorcerer with the Draconic Bloodline you get a base AC of 13 (as long as you wear no armour, page 102). If you multi-class that with a Monk you get ...
8
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3answers
5k views

Can Monks gain the benefit of the Dual Wielder Feat with their Unarmed Strikes?

Simply put - can the Monk class use the Dual Wielder Feat with: A (monk) weapon and an unarmed strike? An unarmed strike "in each hand"? Admittedly this is a similar question to this post about ...
8
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2answers
438 views

When using a tower shields total cover ability, do you lose its AC bonus?

One of my players raised an interesting observation about how the tower shield is worded. In most situations, a tower shield provides the indicated shield bonus to your Armor Class. As a standard ...
7
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2answers
1k views

Does the Monk retain his AC Bonus if he loses his Dex bonus to AC?

Does a monk retain the AC bonus from the AC Bonus (Ex) class feature if he loses his Dex bonus to AC? It says he retains it if he's flat-footed, but there are other ways to lose your Dex bonus to AC.
7
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2answers
8k views

Armor's effect on skills

If I read this correctly then it means that the armor I choose will affect my Dex and Str based skills. Any armor heavier than leather, as well as any shield, hurts a character's ability to use ...
7
votes
3answers
964 views

What is the AC of an inanimate object?

In D&D 5e, what is the AC of an inanimate object, in case someone wants to attack it? Does it depend on its size? Is it different depending on whether you are making a ranged or melee attack?
7
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2answers
980 views

Armor as DR alternate rules: Do untyped AC bonuses apply to Defense or DR?

I'm starting a Pathfinder Campaign with the alternate rule for armor as damage reduction. I'm just wondering what gets changed to damage reduction and what stays defense. For example, a shield's AC ...
7
votes
1answer
314 views

Does Armor have a base +1 AC if made for tiny creatures?

According to the Armor for Unusual Creatures table, tiny or smaller creatures receive half the AC from armor. So what happens to the armor bonus when the armor bonus is only +1? For example, Gnome ...
6
votes
1answer
637 views

Can a monk “wear” Mage Armor without losing their wisdom bonus to AC?

Can a monk use mage armor without losing their wisdom bonus to AC (in 3.5e)? More generally, can a divine caster wearing a monk's belt use greater luminous armor without losing their wisdom bonus to ...
6
votes
1answer
110 views

Does the Armor Class of a potion vial include the users Dexterity modifier?

Page 478 of the core rulebook states: A typical potion or oil consists of 1 ounce of liquid held in a ceramic or glass vial fitted with a tight stopper. The stoppered container is usually no ...
5
votes
2answers
418 views

What AC is used when a prepared action is used to shoot something thats being thrown?

If an archer has prepared an action to shoot using a bow/crossbow/... when an alchemist is going to throw a bomb. What kind of check is it to hit the bomb as he is throwing it? I dont think you would ...
5
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1answer
534 views

What methods exist to get your AC higher than 20 without magic items?

I was poking around answering for this question and noticed something odd. It doesn't seem to be possible except in the case of the Barbarian to naturally get your AC over 20 without the use of magic ...
4
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2answers
789 views

Is my DM being too severe? [closed]

I want to know if my GM is being too harsh on us, as this is our first adventure, so none of us are sure. My party just became level 9. I feel that as a party, our AC is low all around. For example, ...
4
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1answer
933 views

Can I benefit from magical armour while using Mage Armour?

A suit of Studded Leather sets AC to 12 + Dex. A suit of magical +1 Studded Leather gives a +1 bonus to AC while you wear it, for a total of 12 + Dex +1. Mage Armour gives an AC of 13 + Dex. This is ...
4
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6answers
2k views

Is your character's ability to avoid attacks based solely on AC?

I'm new to D&D. I was wondering about a character's ability to dodge attacks that target them. Is AC the only way for a character to avoid being hit, or is there something else that I've missed?...
4
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4answers
224 views

Do the AC Bonus (Ex) class abilities of monks and swordsages stack?

Monk and Swordsage both get the class feature AC Bonus (Ex). Monk: When unarmored and unencumbered, the monk adds her Wisdom bonus (if any) to her AC. In addition, a monk gains a +1 bonus to AC ...
4
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1answer
186 views

Do you lose DEX AC bonus while standing in Grease

Do you lose your DEX bonus to AC while standing in the area of effect of a Grease spell?
4
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1answer
68 views

Where do I find a monster's AC bonus from high dexterity?

There are a couple of ways for a creature to lose its dexterity bonus to armor class. I am used to 3rd/4th/5th monster manuals, where dexterity values are given, but in AD&D 2e I can't find those ...
4
votes
3answers
932 views

Armored Wisdom to AC

Is there any combination of races, classes, items, or feats that allows you to add your Wisdom bonus to AC, without restricting the armor that you wear? Several classes offer Wisdom to AC while ...
3
votes
1answer
250 views

Does the enhancement bonus on armor apply to armor class?

If I have a chain shirt with spell resistance 19 (+5 bonus), does that +5 apply to armor class along with the +4 from the chain shirt?
3
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3answers
290 views

Does the Lizardfolk NPC race's bonus to AC count for all armor

Me and a friend are arguing over whether or not the Lizardfolk NPC race in the DMG get a bonus to AC while wearing armor or a natural AC bonus. So my question is, does the Lizardfolk bonus to AC apply ...
3
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2answers
3k views

Plate armor question

I was playing around with the Character Builder and noticed an oddity with my level 7 half-orc Knight: My character with no armor has a net AC of 16 [10 +3 (half level) +2 (heavy shield) +1 (dex)]. ...
3
votes
1answer
96 views

Can a Helmet Provide an AC Bonus to a Beheaded Familiar?

Background I recently gained a Beheaded Familiar with the Improved Familiar feat. Since it has a slam attack, and is tiny, it would provoke attacks of opportunity to attack with said slam attack. ...
3
votes
1answer
326 views

How can I improve my Touch AC outside of increasing my Dex Mod?

I'm currently playing a LVl5 Caster Druid in a PVP arena, where the other players are quite fond of blaster type characters, and I tend not to last more then 2 or 3 rounds. While I'd like any ...
3
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1answer
106 views

What AC do Bracers of Defence count as for the Weapon Type vs. Armor Type rules?

How do Bracers of Defence affect Base AC in regards to Weapon type vs. Armor type? I play in a campaign that is centered around the Player’s Option series (which might be considered 2.5th edition) ...
3
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2answers
3k views

Charisma Mod to AC?

Is there a way to get your Charisma Modifier to AC other than different revelations* for oracles? I've been looking through the content on the PFSRD and can't find one. I'm hoping there might be ...
2
votes
2answers
238 views

Does the dex bonus to AC from armor and shield stack?

I have a dwarf with full plate armor and a tower shield with dex of 16 (+3). Full plate grants a max dex bonus of +1 to AC and the tower shield +2. Now, can I get both the +1 AND +2 to get a +3 dex ...
2
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3answers
1k views

Do I still get the AC bonus from a shield if I use a 2 handed weapon?

Do I get the +2AC from a shield if it stays on my back all the time? Another way to look at it: If I use my Versatile weapon as two-handed, does my AC go down? I'm still proficient in all my gear, ...
2
votes
2answers
508 views

How does the abstraction of AC make sense when flat-footed?

I am looking for a rule-wise explanation of the logic as to why your deflection bonus (e.g. a shield) is counted in your flat-footed AC. From what I understand, being flat-footed means you didn't see ...
2
votes
2answers
5k views

When using a breath weapon do I roll against armor class?

In the 5e D&D player's handbook, the Dragonborn's Breath Weapon says: The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage ...
2
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2answers
2k views

Are there items that can be worn under/in addition to armor that grant AC bonuses?

Pretty self-explanatory; I began wondering this when I misread the description of Mithral Shirt and thought it could be worn on the body slot in addition to existing armor to grant additional AC ...
1
vote
1answer
119 views

Do AC bonuses from spells stack with AC from equipment?

For classes like the Bloodrager that can wear armor and shields and cast arcane spells: Does the armor bonus to AC from the Mage Armor spell stack with the armor bonus to AC from an actual armor ...
1
vote
2answers
319 views

My Paladin's AC seems way too good. Did I do something wrong?

It's been a couple of decades since my pal and I played first edition AD&D. We recently rolled characters for a new game, but I'm not entirely certain I did my human Paladin's armour class right; ...
1
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1answer
291 views

Some creatures have unbelievably high ACs in the 40s, but how is that even possible to hit? [closed]

I'm looking at creatures in the d20 SRD and seeing monsters that have really high AC, like 45. Is that the correct AC or is it supposed to be something else? And if it is correct, then how is anyone ...
1
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1answer
102 views

Do Storm Giants have a Natural Armour value?

A Storm Giant's AC is 16 due it its scale mail, and it has a Dex modifier of +2, so without the scale armour the giant's AC would be 12. However, a Cloud Giant has a Natural Armour of 14 and a Dex ...
1
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1answer
528 views

Do any of these sources of AC bonuses conflict or negate each other?

My understanding, confirmed by the answer to this question: When a War Caster Wizard carrying a shield casts the spell "Shield" does the AC bonus Stack? is that anywhere an actual +N bonus ...
1
vote
1answer
75 views

Do the AC penalties from a lunge attack and the Samurai's Challenge stack?

If I use the Samurai's Challenge ability against an opponent (−2 AC except for attacks from my target), and use lunge to attack them (−2 AC until my next turn), do these two penalties ...
1
vote
1answer
390 views

Is Magic Armor with an Enhancement Bonus over 4 Automatically Masterwork Armor?

Motivation After seeing this comment, I read this answer and this answer. This gave me the distinct impression that any magic armor with an enhancement bonus of +4 or more is automatically ...
0
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1answer
8k views

D&D Next (Final Playtest): Proficiency bonus and armor?

Do you get a proficiency bonus to AC when wearing armor you are proficient with?