80 votes

Does a natural 20 on the attack roll still automatically hit if the target is wearing adamantine armor?

Yes, the natural 20 is still an automatic hit We know that a critical hit is, by definition, an automatic hit regardless of AC thanks to the basic rules for making an attack: If the d20 roll for an ...
Adam's user avatar
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79 votes

If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?

For "at least one" probability problems, it's usually easier to start by calculating the chance that none of the dice crit, as that saves you the hassle of combining the probabilities of ...
Oblivious Sage's user avatar
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63 votes

If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?

The other answers do a good job of answering the question, but I'll point out how you can answer questions like this in the future: https://anydice.com/ is a very powerful (if slightly complicated) ...
divibisan's user avatar
  • 3,556
58 votes
Accepted

Interactions between unarmed strikes, negative strength and an unconscious target

Unarmed attacks can crit, but do not do double damage Can an unarmed strike crit? - Yes If you roll a 20 on an unarmed strike, it is considered a critical hit. This means that it will ...
Rubiksmoose's user avatar
  • 94.7k
57 votes

How do we deal with my DM's house-rule about critical damage?

Adamantine armor It has the property: While you're wearing it, any critical hit against you becomes a normal hit. (DMG 150) It is only classified as uncommon, but it is still a magic item. Depending ...
Szega's user avatar
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52 votes
Accepted

What are my chances of rolling a natural 19/20 critical if I roll 3d20?

About 27%, or a little over 1/4 This is a pretty easy calculation to run in anydice: As you can see, the percentage chance of rolling at least a 19 one of the d20 rolls is 27.10% So you can expect, on ...
Adam's user avatar
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50 votes
Accepted

Does adamantine armor protect you from being beheaded by a vorpal sword?

No, the creature still loses its head The effect of the vorpal sword is explicit: ...and roll a 20 on the attack roll, you cut off one of the creature's heads. This wording in the item description ...
Adam's user avatar
  • 26.5k
50 votes

How do we deal with my DM's house-rule about critical damage?

Play as a Grave Cleric The Grave Cleric domain from XGtE (p. 20) has the following ability at level 6: As a reaction when you or a creature you can see within 30 feet of you suffers a critical hit,...
Sdjz's user avatar
  • 36.4k
48 votes

What are the consequences of removing the potential for critical hit extra damage on spell attacks?

There's a balance problem here, but not the one you think. To answer the actual in-the-title question first... Removing crits from spells results in a downturn in a spellcaster's damage potential at ...
guildsbounty's user avatar
  • 65.6k
45 votes

Can an Assassin stack critical hits?

If you hit, it is already considered a critical hit This is the case regardless of whether you then roll a natural 20 or not. When the Rogue is assassinating a surprised target, it will be a ...
Jamie Brace's user avatar
  • 8,442
44 votes

Is acid splash automatically a critical hit against an unconscious creature?

Sorry, but No The Key Word here is Attack. Attacks as defined in the PHB are D20 rolls against AC. From PHB, 194 If there’s ever any question whether something you’re doing counts as an attack, the ...
NotArch's user avatar
  • 125k
44 votes

Handling critical hits easily when using average damage

1st Double the average.2nd Subtract the damage modifier. "it includes the damage bonus twice." So subtract once. 5 (1d6+2) ×2=10 -2=8 Alternative to be more accurate. This is only ...
FenrirG's user avatar
  • 4,807
40 votes
Accepted

Does a critical hit from an expanded crit range always hit regardless of AC?

Yes for the Champion's instance of an expanded critical range. Improved Critical specifically says you score a critical hit on a 19 or 20. A critical hit is a type of hit; by scoring one, you've also ...
CTWind's user avatar
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40 votes
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Handling critical hits easily when using average damage

There are two mathematically equivalent ways to think about/remember the technique I am presenting here. Since this question seeks to find a method that makes a DM's work easier and it only works if ...
Rubiksmoose's user avatar
  • 94.7k
37 votes
Accepted

Can an AoE spell crit an unconscious creature?

A fireball or a similar AoE spell would not crit The Unconscious condition does state that (from the SRD p. 359, emphasis mine): Any attack that hits the creature is a critical hit if the attacker ...
Sdjz's user avatar
  • 36.4k
37 votes
Accepted

When did rolling a natural 20 on the d20 become a "critical success" in the history of Dungeons & Dragons?

The first appearance of natural 20 as a critical hit in published rules seems to be in AD&D2e, on p. 86 of the Dungeon Master's Guide. It's explicitly an optional rule. AD&D1e specifically ...
John Dallman's user avatar
34 votes
Accepted

Can the Portent ability of a Diviner Wizard negate a critical hit?

Not as such, because the roll is never made. Unlike the Bardic Inspiration, which modifies an existing roll (in this case a critical hit, the Portent die completely replaces the roll before it is ...
keithcurtis's user avatar
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32 votes
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Can a Rogue Assassin stack Sneak Attack and Assassinate?

You are correct. You deal 8d6 + ability mod damage if both attacks hit Let's go through how we get there: On a crit, you double all of the dice you would have rolled, including sneak attack, then add ...
Adam's user avatar
  • 26.5k
32 votes

Would treating critical hits as "called shots" have unintended consequences?

As long as the crit is unchanged, then it is balanced. If nothing is different besides the narration, then by definition the mechanics of the game remain balanced, at least to a first approximation. ...
Ruse's user avatar
  • 18.1k
31 votes
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Can you wait to add optional damage dice that apply on a hit (such as Divine Smite) until after seeing if the roll is a critical?

Yes You've already listed the related rules. Yes, additional damage dice are doubled on a critical hit. Yes, that means you can choose to smite when you see you've got a critical hit. Yes, it's ...
Ceribia's user avatar
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30 votes
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What are all the ways to increase the chance of a critical hit?

The Player's Handbook lists a few different methods of ensuring critical hits, or at least making them easier to obtain. You mentioned a few of them, but I will include them here as well for ...
Dungarth's user avatar
  • 6,219
30 votes

Would getting a natural 20 with a penalty still count as a critical hit?

Player's Handbook, page 194: Rolling 1 or 20 [...] If the d20 roll for an attack is a 20, the attack hits regardless of any modifiers or the target's AC. In addition, the attack is a critical hit, as ...
Darth Pseudonym's user avatar
30 votes

Does a Champion fighter automatically hit someone wearing Adamantine Armor if they roll a 19 (or 18 at higher levels) on the attack roll?

Yes, the attack still hits It follows from the wording of Adamantine Armor: … any critical hit against you becomes a normal hit. Improved critical hits are critical hits. Adamantine Armor turns ...
Dale M's user avatar
  • 211k
29 votes

How does extra damage work for critical hits?

You only roll extra dice for effects that explicitly add the damage to the attack. I have not found an definitive statement in the PHB that addresses this question. However, I think that we can draw ...
Icyfire's user avatar
  • 63.6k
29 votes

Is there any way to score an automatic natural 20?

Natural 20 In 5th Edition, there are a couple of different things that reference the face value on the die, regardless of modifiers. This is commonly referred to as a "natural roll" - ...
T.J.L.'s user avatar
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29 votes
Accepted

Do these rules for Critical Successes and Critical Failures seem fair?

It's probably fair, but also spectacularly unlikely to ever matter. I've played dozens of sessions of 5e in the past year, and this has literally come up never. Plus, if it ever does come up that ...
Erik's user avatar
  • 81k
29 votes
Accepted

Do effects that activate on a critical hit still activate when the hit is against an opponent wearing adamantine armor?

No If it's not a critical hit, then it's not a critical hit. The adamantine armor specifically states: While you're wearing it, any critical hit against you becomes a normal hit. A hit remains ...
NotArch's user avatar
  • 125k
29 votes
Accepted

Can I choose not to multiply my damage on a critical hit?

Consult your DM, but by a literal RAW reading, you shouldn't be multiplying the -4 (or any other damage penalties) on a critical hit, ever. Critical hit rules in 1e Pathfinder read as follows... A ...
TheFallen0ne's user avatar
  • 4,408
28 votes
Accepted

What rules turn any attack that hits a given target into a critical hit?

Paralyzed and Unconscious both produce automatic crits With the caveat that you have to be within short range, however. From the Players Handbook - Page 291 Paralyzed A paralyzed creature is ...
JohnP's user avatar
  • 10.3k
27 votes
Accepted

What happens when you roll a critical on both advantage dice?

There Is No Difference When [you have advantage], you roll a second d20 when you make the roll. Use the higher of the two rolls… (PH 173). Even though you're rolling two dice, you are only using one ...
Christopher's user avatar
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