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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38
votes
8answers
12k 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 ...
8
votes
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 ...
4
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0answers
138 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 ...
63
votes
14answers
300k 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 ...
36
votes
7answers
8k 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 ...
14
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4answers
7k 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
votes
1answer
435 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
votes
1answer
291 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
46k 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
votes
1answer
40k 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 ...
2
votes
4answers
593 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 - ...
5
votes
1answer
398 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?
29
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4answers
65k 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 ...
6
votes
4answers
2k 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
votes
1answer
1k 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
votes
3answers
16k 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
votes
4answers
714 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
votes
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
votes
1answer
485 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
votes
1answer
172 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
votes
1answer
216 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
votes
1answer
90 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
votes
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
6k 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
23k 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
votes
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
votes
3answers
84 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
votes
1answer
310 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 ...
4
votes
1answer
175 views

Can you wield the Staff of Defense and a shield, and have their AC bonuses stack with the Mage Armor spell?

The staff of defense from the Lost Mine of Phandelver Starter Set campaign (p. 53) is a magic staff that grants +1 to AC when attuned. As a magic staff, it also functions as a quarterstaff, which has ...
31
votes
4answers
44k 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 ...
7
votes
1answer
2k views

Does a monster's AC change when it doesn't use its shield?

Every monster has a specific AC in its stat block. The rules don't explicitly say anything like "subtract 2 from AC if the creature doesn't use a shield", do they? Does that mean a monster always has ...
11
votes
2answers
3k views

Can a warforged druid use composite plating?

A druid gains medium armor proficiency, but is not allowed to use metal armor. A warforged with medium armor proficiency can normally set their Integrated Protection to Composite Plating, granting an ...
1
vote
1answer
347 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 ...
5
votes
1answer
212 views

Does armor class protect against damage from falling objects?

Does armor class protect against damage from falling objects? Let’s say we have average Munchkin McGee. Now, he boosts his AC to Celestia and back, then his damage reduction to the Abyss and back. I ...
6
votes
2answers
582 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 ...
2
votes
3answers
524 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 ...
0
votes
0answers
77 views

Possibility of DND 5e AC buld-up [duplicate]

I read in the DND 5e player's handbook about AC and I'm confused if my build is ok or not. I'm trying to create lvl 4 character with a lot of AC with a light armor. So here it is: A Tabaxi, Fighter ...
5
votes
1answer
303 views

Do Tiny animals get an AC bonus?

In Pathfinder 2e, do tiny animals get a circumstance bonus to AC? Would a Tiny familiar get that same bonus?
8
votes
2answers
588 views

Is there an official source for the properties of stone?

The issue comes up mainly in relation to the spell wall of stone, which states that: A nonmagical wall of solid stone springs into existence at a point you choose within range. [...] The wall is ...
4
votes
2answers
199 views

What is the AC of a Human with 16 dex combined with the spell Armor?

The Spell Armor (Unearthed Arcana p.51-52) states: The caster creates ,a magical field of force which serves as if it were leather armor (AC 8). If the spell is cast upon a person already armored, it ...
-9
votes
2answers
44k views

What is Armor Class used for?

I have never understood or found any answer to how to use your AC. Is it something the GM have to keep in mind all the time to reduce or add damage to specific players based on how high their AC is, ...
20
votes
4answers
5k 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
votes
4answers
5k 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 ...
9
votes
6answers
4k views

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

I was poking around answering for this question about the highest AC possible for a sorcerer and noticed something odd. It doesn't seem to be possible except in the case of the Barbarian to naturally ...
15
votes
2answers
2k views

What is the AC of a Warforged Druid when Wild Shaped?

When a Warforged Druid uses Wild Shape, how is its Armor Class determined? Will the AC be based on the Warforged's Integrated Protection trait (E:RftLW, p. 36; WGtE, p. 70), or the animal's natural ...
9
votes
3answers
672 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 ...
4
votes
1answer
72 views

Dervish of Dawn (Fighter) reducing higher charge AC penalties

Burst of Speed (Ex) At 3rd level, a dervish takes only a –1 penalty to her AC after charging. At 7th level, the dervish can charge with no penalty. This ability replaces Armor Training 1. - ...
11
votes
3answers
3k views

What are the ramifications of changing Armor Class to be Constitution-based instead of Dexterity-based?

It's never made much sense to me that your Armor Class is based on your Dexterity modifier, which carries the implication that you're harder to hit because you're somehow nimbly moving out of the way ...