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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4
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1answer
73 views

Apply force armor from mage armor/inertial armor/etc. against touch attacks?

I want to cast a spell or manifest a power that provides a +4-or-greater bonus to AC that lasts hours/level or longer, and have it apply to touch attacks. The mage armor, luminous armor, and greater ...
6
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1answer
1k views

Does the UA Mystic's Tough Hide bestial transformation (+2 AC) stack with the UA Warforged's Composite Plating trait (+1 AC)?

Unearthed Arcana: The Mystic Class contains the most recent version of the Mystic class (v3). One of the psionic disciplines listed is Bestial Form; one of its psionic effects is Bestial ...
16
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5answers
2k views

How can I reliably increase our giant ape's AC to 16 (or better)?

A tactical problem to solve based on last night's session Tactical Situation Wizard polymorphs warlock (8th level) into a Giant Ape. (Did T-Rex last time, looking for variety and higher INT (7 vs 2); ...
7
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4answers
25k 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 ...
16
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2answers
59k 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 ...
27
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9answers
6k views

Can you lower your AC on purpose?

For roleplaying reasons I would like to make a NPC appear weaker than it actually is. When the players first fight it, it should seem to have a very low AC and miss many attacks. Is this possible in ...
10
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3answers
2k views

Can you decide not to use a shield's AC bonus? Dex bonus?

Let's say that there is a combat. There's is one player character and two enemies- one melee and one ranged. The player character has Armor of Agathys (or some other spell) and wants the melee ...
10
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1answer
576 views

Summon spells and AC

The summon spells introduced in Tasha's Cauldron of Everything include an armor class calculation, but it's unclear from the description if the AC should include the dexterity modifier or not. For ...
3
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1answer
130 views

What is the chance of being hit?

As a companion to this question, what is the expected chance of being hit by an average monster of your level?
7
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1answer
447 views

Are there any rules or guidelines that demonstrate how many hit points an increase in AC is worth?

I am trying to determine if I should increase the base hit points, or the starting AC for my monsters to make them a bit more challenging for my players due to the size of the party (7-8 players). Is ...
65
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15answers
352k 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 ...
5
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1answer
307 views

Does wearing magic items with armor affect AC negatively?

If I’m wearing a set of full plate armor and I replace the gauntlets with gauntlets of ogre strength do I lose the AC provided by the full plate as I’m no longer wearing a full set of full plate ...
6
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2answers
317 views

Does losing Dex to AC also apply to CMD?

Relevant rules: CMD: ...Any penalties to a creature's AC also apply to its CMD. A flat-footed creature does not add its Dexterity bonus to its CMD... blind: ...The creature cannot see. It takes a –...
42
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8answers
13k 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 ...
31
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4answers
72k 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 ...
3
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4answers
824 views

What can a dragon use to increase their armour class? [closed]

It is hard to survive as dragon - and yet they do. Despite being known for their nasty claws+bite, fear radiance and breath weapon - thus becoming a high priority target for nearly any ranged attack - ...
18
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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?
11
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2answers
1k views

Can Tortles receive the non-AC benefits from magic armor?

The Tortle's Natural Armor trait says: Due to your shell and the shape of your body, you are ill-suited to wearing armor. Your shell provides ample protection, however; it gives you a base AC of 17 (...
21
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1answer
761 views

Is Armor Class a difficulty class (DC)?

Frightened talks only about DCs: [...] You take a status penalty equal to this value to all your checks and DCs [...] Compare it to Clumsy: [...] You take a status penalty equal to the condition ...
24
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5answers
41k views

Is there any difference between Studded Leather and Breastplate if my AC is the same with both?

Playing 5e with a Rogue. To make a long story short: In my possession I have both Studded Leather armor and a Breastplate. With my 18 Dexterity, My AC with Studded Leather is 16 (12+4). But if I don ...
23
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10answers
5k 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 ...
41
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7answers
10k views

How do I explain to an AD&D player that items that increase Armor Class in D&D 5e are overpowered?

Context: I have recently started a campaign with a new player that comes from an AD&D background. He wishes to convert and import his character to the campaign. We did this once, and I helped him ...
4
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2answers
623 views

Lycanthrope AC & Magical Armor

Just a quick question here. One of my players was bit by a Lycanthrope and is currently cursed. Thing is that he plans on staying that since alignment won't alter anything for him. According to the ...
6
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3answers
2k views

Natural 20 vs higher AC

If a character or creature has an AC that with all bonuses requires a 20 to hit does that mean that every hit is a crit? Or alternately the creatures AC is so high that with all bonuses no hit would ...
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5answers
6k 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 ...
15
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4answers
8k 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 ...
4
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0answers
170 views

How does defense work? [closed]

I'm new to D&D and I want to make a new character, he is a warlock with 11 hp and 13 armor class. What should I do when I get attacked? Damage - defense? I don't have the books, I'm using D&D ...
14
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4answers
8k 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 ...
0
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1answer
540 views

What is the AC of a sprite familiar (from the Find Familiar spell) if it is dismissed to a pocket dimension and then caused to reappear as an action?

The most recent Sage Advice Compendium erratas the find familiar spell so that familiars are now stripped naked when dismissed to a pocket dimension. The Pact of the Chain warlock can summon a Sprite ...
-6
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1answer
705 views

Can a character wear both chain mail and leather armor to get a higher AC?

Background I am reading the Goblin Slayer light novel. In it the main character wears leather armor over plate or chain to both stack his AC and to confuse his (not very intelligent) enemies into ...
11
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4answers
50k 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 ...
10
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3answers
1k views

Does the DMG's “Disarm” bypass AC?

In the DMG at pg. 271 the disarm described appears to bypass the defenders AC: it is a contest of attack roll vs. skill. There is no mention of AC being a factor. So could a L1 human fighter tavern ...
6
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1answer
56k views

Does an attack hit if it exactly matches the target's AC?

For an attack to successfully hit a given Armor Class, would it need to get a number higher than the Armor Class? Or does it hit if the total exactly equals the Armor Class value as well? Does the ...
5
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1answer
453 views

Can you stack dodge modifiers?

You can choose the Combat expertise feat and the Dodge feat. Both of them grant dodge modifiers to Armor Class. Are their Armor Class modifiers stacked?
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4answers
3k views

How to open a door with AC 15, 18 hit points?

I'm learning to play D&D and I'm following the Frozen Sick adventure from D&D Beyond. At some point, the players need to open a door with "AC 15, 18 hit points". I think AC means ...
5
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1answer
2k views

In Wild Shape for druid5/barbarian1, how does unarmored defense work? [duplicate]

Background: My Hill-dwarf character started out as a barbarian. When his clan battled the undead hordes, he barely escaped with his life. He was taken in by a druid, and discovered a higher calling. ...
13
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3answers
18k 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 ...
11
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4answers
859 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 ...
11
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2answers
2k views

What is the AC equivalent of mirror image?

It is suggested (by the DMG) to account for defensive options by assuming increased AC, e.g. +2 AC for magic resistance. I would like to give some of my monsters the spell mirror image as part of a ...
7
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1answer
1k views

Does the +1 AC bonus from the Warforged racial trait Integrated Protection and the Forge Domain cleric's Blessings of the Forge stack?

The Warforged race (from Eberron: Rising from the Last War, p. 36) has a racial feature called Integrated Protection, which among other things, grants the following: You gain a +1 bonus to Armor ...
7
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1answer
191 views

Which hybrid classes give alternative ways to calculate AC?

In D&D 4e some hybrid classes provide alternative ways to calculate AC. I know about Hybrid Runepriests (Serene Blade) using Wisdom. What other class-ability combinations are there?
4
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1answer
277 views

How to convert armour class from Pathfinder 1 to D&D 5?

My sandbox game uses some material from Pathfinder (and D&D 3 and 3.5). I run games there using D&D 5 (among other rules systems). How do I convert the armour class of a creature (especially ...
3
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1answer
94 views

Against which AC do you check on the strikes of the Tiger Claw discipline?

As the title says. If, let's say, I catch my opponent flat-footed and use Claw at the Moon, do I check against flat-footed AC or complete AC? Claw at the Moon: As part of this maneuver, you attempt a ...
11
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3answers
3k views

Can I craft a 25 AC piece of armor?

When using the Craft skill to create armor. It says the difficulty to create an armor is 10+AC bonus. So, can I create an armor that gives 25 AC? The DC would be 35. I wonder if it's possible to ...
15
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3answers
2k views

How does AC scale with character level?

In D&D 3.5, I know that base attack bonus scales with level. How does AC increase over levels to meet it? I know saves do, so there should be some kind of AC thing? Is it done more with HP, or is ...
22
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3answers
7k 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, “...
21
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3answers
24k 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 ...
0
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3answers
90 views

What is the AC of a Wall of Bone?

The spell Wall of Bone details a number of statistics about the sections of wall created, including HP, but the description says nothing about AC. It is based on Wall of Stone but that spell does not ...
3
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1answer
765 views

Enhancement bonuses to armour and natural armour stacking

The Ironskin spell states as follows (emphasis mine): You gain a +4 enhancement bonus to your existing natural armor bonus (if you do not have a natural armor bonus, you are considered to have an ...

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