Questions tagged [armor-class]

For questions about Armor Class (AC), the mechanical abstraction of how difficult it is to hit and cause damage to an opponent in D&D and related RPGs.

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29
votes
4answers
41k views

Does natural armor stack with unarmored defense?

In D&D 5E, does natural armor stack with Unarmored Defense? We have a level 2 player character who wild shaped into an animal. The player said they could stack its natural armor with Unarmored ...
53
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12answers
260k views

What is the highest possible AC?

Assuming you are level 20, and have access to any magic item, how high can you get AC (permanently or for a set duration)? Constraints: Magic items are those on the tables in the D&D 5th ...
27
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4answers
59k views

How does Mage Armor interact with Unarmored Defense?

If a character with the Unarmoured Defence class feature casts Mage Armour, what is their AC? Do they choose which 'base' AC they take, or do they stack somehow? Is there rules text that explains ...
21
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3answers
22k 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 ...
13
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1answer
5k 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 ...
30
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6answers
8k views

Can someone decide to be hit?

In this question, I asked about whether a character could willingly not use their shield or Dex bonus on certain attacks due to wanting to be hit. This raises the greater question- Can someone decide ...
13
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3answers
26k views

Can a Beast Master ranger armor their animal companion with barding?

I was reading about the Barding rule on page 155 of the PHB, and I was just curious if a Beastmaster Ranger could armor up their companion? If so, how would that stack with the Ranger's proficiency ...
12
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5answers
42k views

How does barkskin work?

Now the wording in the spell description is extremely vague and ambiguous making the spell effect up for interpretation. It just says: ... the target's AC can't be less than 16, regardless of what ...
24
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2answers
38k views

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 ...
29
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8answers
42k views

How does a DM deal with a PC with an abnormally high Armor Class?

One of the Fighters in my party has an AC of 21 at level 5. He wears chainmail which gives an AC of 16, has the Defense Fighting Style which gives a +1 to AC when wearing armor, and a +2 shield (found ...
15
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1answer
10k views

Does Mage Armor stack with the Shield spell?

Mage Armor sets the target's base AC to 13+Dex. The Shield spell 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?
37
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7answers
11k views

Mathematically, is a +2 bonus to AC better than attackers having disadvantage?

Mathematically speaking, I'm trying to determine if Bracers of Defense (AC+2) is better than a Cloak of Displacement, which causes all attackers to have disadvantage on attack rolls against you. If ...
26
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8answers
40k views

What is the highest AC possible for a sorcerer?

What is the highest Armor Class achievable for a Sorcerer with the Sorcerous Origin of Draconic Bloodline? Player's Handbook Chapter 6 variant rules included. (Multiclassing, Feats, etc.)
19
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10answers
4k views

Does rolling AC to oppose an Attack Roll impact game balance?

I really like the concept of rolling d20 against each other during ability checks like grappling, etc. I want the same thing for normal attacks, so the defender would also roll a d20 + (AC-10). Would ...
22
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3answers
4k views

What is the lowest possible AC?

This is a direct, somewhat silly, opposite question to What is the highest possible AC? . I’m wondering what is the lowest possible Armor Class a Player Character can get at any point in time, “...
20
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1answer
761 views

Which Armor Class values should be used as controls when making damage calculations?

It is known that occasionally questions will pop up that are about attempts to optimize a character's damage output (sometimes shorthanded as DPR, or Damage-per-Round), and veterans of this game know ...
14
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1answer
2k views

As a Swords bard, how do I determine my AC bonus from Defensive Flourish on a critical hit?

Let's say I'm playing a College of Swords bard, and happen to critically strike an enemy with a natural 20. I choose to use my Defensive Flourish at this time, so the dice look like this: 2d6 (...
12
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3answers
6k views

Does an unconscious creature still use its dexterity to avoid attacks?

Related - How does one dispatch a helpless opponent? Here's the unconscious condition description: Unconscious An unconscious creature is Incapacitated, can't move or speak, and is unaware of ...
15
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6answers
3k views

Consequences of having half damage on attacks that tie AC as house rule?

Typically if an attack roll equals the AC of a target then the attack does normal damage. I quite like the idea of making it a glancing blow, dealing half damage instead, this would help clue the PCs ...
14
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3answers
12k views

Is there Touch AC and/or Flatfooted AC in 5th Edition D&D?

Does D&D 5E have a mechanic similar to Touch AC or Flatfooted AC as it exists in D&D 3.5? To put it simply, in D&D 3.5, touch AC excludes armor bonuses when armor can't help against an ...
12
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3answers
15k views

Will adding helmets unbalance the game?

I can't find any mention of a helmet in the Player Handbook in the armour table, and the only helmets I can find are magic items like The Helm of Telepathy. Would it be unbalanced to allow helmets to ...
10
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3answers
12k 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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5answers
7k views

Staff of Defense total AC and Shield Stacking

My party is about to confront Glasstaff and potentially obtain the Staff of Defense. This slender, hollow staff is made of glass yet is as strong as oak. It weighs 3 pounds. You must be attuned to ...
7
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1answer
2k 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
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1answer
4k 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 ...
5
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3answers
18k views

Average AC of monsters per CR?

In D&D 4e, you could tell most monster's AC just from its level and role (Brute, Skirmisher, Soldier). This is not the case in 5e, but an estimation would be very useful when you try to compare ...
2
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3answers
301 views

AC calculation with a Defense Fighter + Shield + Defensive duelist

I try to create a lvl 4 character with a lot of AC. I'm not sure if it's ''legal'' So here it is: Studded leather armor : 12 AC Dex mod : +3 Shield + 2 AC Fighter Defensive style : +1 Ac Feat ...
2
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1answer
755 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 ...
25
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3answers
333k 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 if ...
27
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3answers
5k views

What rules or guidelines are there about when to allow a party to acquire plate mail?

I have heard it said that 5e does not balance its encounters with respect to magic items; in other words it does not consider possession of magic items when defining appropriately challenging ...
20
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4answers
4k views

What is the highest possible temporary AC at level 1, without any help from others?

Assuming you are level 1 and have access to any item that you can afford at character creation rolling the maximum amount of starting gold, and all spells that are available to you due to character ...
10
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4answers
4k views

What is the highest possible permanent AC at character creation?

Assuming you are level 1 and have access to any item that you can afford at character creation rolling the maximum amount of starting gold, how high can your permanent AC become (permanently, not for ...
20
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6answers
35k views

How do you calculate THAC0?

We're playing AD&D 1st edition and we have been asked by the DM to calculate our THAC0s so as to speed things up. So, I get what THAC0 stands for (To Hit Armour Class 0) but it's not something I ...
13
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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 Is ...
13
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3answers
3k views

Can a character dodge an attack that beats their Armor Class?

I am DMing a campaign. The party was fighting two castle guards, and killed one of them. The other guard attacked them, got past the AC of one of my players. He said he could dodge, but I don't know ...
11
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3answers
55k 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 ...
6
votes
2answers
492 views

What is the highest possible unarmored AC?

What is the highest possible AC a character can get by themselves with no armor or a shield? Constraints: Must be obtainable with a single character, by themselves, with no help from any other ...
6
votes
4answers
509 views

What's my most efficient use of spell slots to help my AC?

I've got a wizard with 11 Dex and I'm trying to figure out what my most efficient use of spell slots is to help me from getting hit. We typically have 2-4 very difficult encounters per day and I want ...
17
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2answers
2k views

How much attack damage does the AC boost from a shield prevent on average?

Statistically, how much attack damage does the AC boost from a shield prevent on average? I've seen claims it results in a 10% reduction in damage taken, is that accurate?
14
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2answers
52k views

Does Size Affect AC?

I have been playing 3.5 for 6 years now and am trying out 5e. Does size affect AC in 5e? In 3.5 a tiny creature would get a bonus to their AC for being smaller, while a huge creature would get a ...
8
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6answers
2k 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 ...
5
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2answers
23k 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 ...
4
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3answers
4k 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 ...
16
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1answer
3k views

Do tortles get a bonus to AC from a shield while using Shell Defense?

Shell Defense. You can withdraw into your shell as an action. Until you emerge, you gain a +4 bonus to AC, and you have advantage on Strength and Constitution saving throws. While in your shell, you ...
13
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4answers
2k views

Is gaining 1 AC in exchange for disadvantage on Perception checks a balanced trade?

Inspired by this answer, and to avoid lengthy back and forth comments, I decided to make this a question in itself. You can put on your helmet for +1 AC and disadvantage on Perception checks. In ...
12
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1answer
874 views

Does Medium Armor's Max dex also put a cap on the negative side?

I know heavy armor ignores Dexterity modifiers for AC calculations, but what about medium armor for a character with a -3 to their dexterity? Does Medium armor bottom out at -2, or will -3 still apply?...
12
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3answers
12k 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?
12
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2answers
2k views

Is it possible to increase the AC of a mirror image duplicate?

Pretty straight forward question. By RAW, is it possible to increase the AC of the duplicates created by mirror image or they will always have an AC equal to 10 + Dex modifier? Be it using other ...
12
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2answers
5k views

Is the UA Warforged considered to naturally be wearing armor?

I know Warforged are Unearthed Arcana races, and considered in play testing and/or incomplete, but based off of the information available to Warforged, would you consider a Warforged to be wearing ...
9
votes
3answers
563 views

For the Battle Master fighter's Know Your Enemy feature, what happens if the target's AC changes while the target is being observed?

Know Your Enemy (PHB, p. 73-74) is a Battle Master fighter feature that lets you determine whether a creature's Armor Class is superior, equal to, or inferior to yours. What happens if a character's ...