Combat Mechanic Advantages and Disadvatages

[-{AU}-Piracy]

My current understanding is combat is decided by a dice roll but I am struggling to fully understand it. It seem like there is two dice rolls. One roll to decide if you hit or not and the second to decide how much damage? An advantage is like a 1 plus on whatever you roll and a disadvantage is negative 1. Is this correct? I am really not sure how the game work out your chance to hit, and how much damage you perform for the attack.

[EricHVela]

Advantage is 2 rolls and take the highest.

Disadvantage is 2 rolls and take the lowest.

There will be a green double dice icon for advantage and a red one for disadvantage. The reason for them should be listed next to the icon.

[Ironwu]

Advantage means you roll TWO 20 sided dice and take the HIGHEST roll to see if you hit.

Disadvantage means you roll TWO 20 sided dice and take the LOWEST roll to see if you hit.

High rolls are better.

[Tenor Sounds]

Yep, two rolls: a 20-sided dice (or "d20") + bonuses to see if you hit and then a roll for damage if you do hit (dice used for damage are based on the kind of attack).

Advantage and disadvantage are very simple: if you have advantage on a roll you roll two d20's and take the higher number; if you have disadvantage, you roll two d20's and take the lower number. They only affect d20 rolls, not damage rolls.

Edit: the d20 roll to see if you hit is compared to the target's AC (armor class); if it is greater or equal to their AC, the attack will hit and you get to roll for damage.

[Hobocop]

Advantage/Disadvantage is a specific mechanic where you roll two dice and take the better/worse result respectively, typically denoted by green or red D20 dice symbols and upward/downward pointing arrows.

[Canadian Ninja]

Advantage or disadvantage means you roll a second 20 sided die, a d20, and you either use the higher result (advantage) or lower (disadvantage). They are thus extremely useful to gain.

For damage, advantage or disadvantage doesn't directly impact it, but since you are rolling twice to hit, you have a higher chance to roll a 20 and land a critical hit. Otherwise the weapons all have their own damage dice type, ranging from a 1d4, 1d6, 1d8, 1d10, 1d12 and 2d6. Those are rolled only if you hit, and then you add any damage modifiers such as your strength or dex modifier depending on the weapon

[EricHVela]

I haven't paid too much attention when there weren't two dice. I only cared about what gave me advantage or disadvantage.

Do you know if they use the tabletop rules of any advantage with any disadvantage negates all dis/advantages?

(I know that Dis/Advantage doesn't stack with itself as per 5e rules. 3 things that give advantage is still just 1 advantage. But tabletop rules are 3 things that give advantage with 1 thing that gives disadvantage means there's neither. Is this what BG3 also does?)

[Recjawjind]

Originally posted by EricHVela:

I haven't paid too much attention when there weren't two dice. I only cared about what gave me advantage or disadvantage.

Do you know if they use the tabletop rules of any advantage with any disadvantage negates all dis/advantages?

(I know that Dis/Advantage doesn't stack with itself as per 5e rules. 3 things that give advantage is still just 1 advantage. But tabletop rules are 3 things that give advantage with 1 thing that gives disadvantage means there's neither. Is this what BG3 also does?)

Should negate all.

[-{AU}-Piracy]

Originally posted by Canadian Ninja:

Advantage or disadvantage means you roll a second 20 sided die, a d20, and you either use the higher result (advantage) or lower (disadvantage). They are thus extremely useful to gain.

For damage, advantage or disadvantage doesn't directly impact it, but since you are rolling twice to hit, you have a higher chance to roll a 20 and land a critical hit. Otherwise the weapons all have their own damage dice type, ranging from a 1d4, 1d6, 1d8, 1d10, 1d12 and 2d6. Those are rolled only if you hit, and then you add any damage modifiers such as your strength or dex modifier depending on the weapon

When you say 1d4 do you mean 1 dice 4 sides or 1 dice and i need 4 from the 20 side dice?

[-{AU}-Piracy]

Thank you all for the responses. I really appreciate it.

[Tenor Sounds]

Originally posted by -{AU}-Piracy:

When you say 1d4 do you mean 1 dice 4 sides or 1 dice and i need 4 from the 20 side dice?

1d4 = roll one 4-sided dice
1d20 = roll one 20-sided dice
2d8 + 1 = roll two 8-sided dice, add them together, then add 1 to the result
etc.

You can use this notation to express complex dice rolls. For example, if I wanted to express an attack roll of a hypothetical level-1 fighter that is using a longsword, it would be like this:

1d20 + 5 to hit, 1d8 + 3 for damage. The first part represents 1d20 + the fighter's strength bonus + their proficiency bonus, resulting in a possible value from 6 to 25. The 2nd part represents a longsword's base damage (1d8) plus the fighter's strength bonus, resulting in a possible value from 4 to 11.

[アンジェル]

Originally posted by -{AU}-Piracy:

Combat Mechanic Advantages and Disadvatages
My current understanding is combat is decided by a dice roll but I am struggling to fully understand it. It seem like there is two dice rolls. One roll to decide if you hit or not and the second to decide how much damage? An advantage is like a 1 plus on whatever you roll and a disadvantage is negative 1. Is this correct? I am really not sure how the game work out your chance to hit, and how much damage you perform for the attack.

Originally posted by -{AU}-Piracy:

Originally posted by Canadian Ninja:

Advantage or disadvantage means you roll a second 20 sided die, a d20, and you either use the higher result (advantage) or lower (disadvantage). They are thus extremely useful to gain.

For damage, advantage or disadvantage doesn't directly impact it, but since you are rolling twice to hit, you have a higher chance to roll a 20 and land a critical hit. Otherwise the weapons all have their own damage dice type, ranging from a 1d4, 1d6, 1d8, 1d10, 1d12 and 2d6. Those are rolled only if you hit, and then you add any damage modifiers such as your strength or dex modifier depending on the weapon

When you say 1d4 do you mean 1 dice 4 sides or 1 dice and i need 4 from the 20 side dice?

Have a look here
https://steamcommunity.com/sharedfiles/filedetails/?id=3107682627
it contains the information you have been asking for and some more - it might help you with the understanding. Feel free to ask if something is still unclear.

[Pan Darius Cassandra]

Advantage means you roll twice and use the highest roll, disadvantage is the opposite, you roll twice and use the lowest roll.

[Maraxus]

20 sided die represents hit chance it has nothing to do with damage...

Here are the chances to get at least a certain number in a d20

1 -> 100% (20/20 * 100)
2 -> 95% (19/20 * 100)
3 -> 90% (18/20 * 100)
4 -> 85% (17/20 * 100)
5 -> 80% (16/20 * 100)
6 -> 75% (15/20 * 100)
7 -> 70% (14/20 * 100)
8 -> 65% (13/20 * 100)
9 -> 60% (12/20 * 100)
10 -> 55% (11/20 * 100)
11 -> 50% (10/20 * 100)
12 -> 45% (9/20 * 100)
13 -> 40% (8/20 * 100)
14 -> 35% (7/20 * 100)
15 -> 30% (6/20 * 100)
16 -> 25% (5/20 * 100)
17 -> 20% (4/20 * 100)
18 -> 15% (3/20 * 100)
19 -> 10% (2/20 * 100)
20 -> 5% (1/20 * 100)

So you can see each point in the d20 represents a 5% chance(makes sense since 20 times 5 is 100).

So here is an example lets say an enemy has Armor Class 12.

That means that you need to roll at least a 12 on the d20 and you'd have a 45% chance to hit it. But what if you have a +4 bonus to hit from various sources? then you'd only need an 8 and you'd have a 65% chance to hit it instead.

Now with advantage(which is an extra mechanic, not always present) you roll 2 d20's and pick the highest one, obviously that alters the probabilities very much to your favor(the inverse is true for disadvantage).

This site has expanded probabilities for advantage and disadvantage[onlinedungeonmaster.com]

Okay say you rolled the number needed to hit(with or without advantage or disadvantage), only then is when damage is rolled, which uses dice which usually range from 4 sides to 12(which is what is called 1d4, 3d6 etc),

[Tenor Sounds]

Originally posted by Maraxus:

20 sided die represents hit chance it has nothing to do with damage...

Here are the chances to get at least a certain number in a d20

1 -> 100%
2 -> 95%
3 -> 90%
4 -> 85%
5 -> 80%
6 -> 75%
7 -> 70%
8 -> 65%
9 -> 60%
10 -> 55%
11 -> 50%
12 -> 45%
13 -> 40%
14 -> 35%
15 -> 30%
16 -> 25%
17 -> 20%
18 -> 15%
19 -> 10%
20 -> 5%

I think you're showing these percentages in the context of a hypothetical attack vs. AC situation, but on its face it seems like you're saying "there is a 100% chance of getting a 1, but only a 5% chance of getting a 20 when you roll a 20-sided die", lol

[Soteria]

Originally posted by Tenor Sounds:

Originally posted by Maraxus:

20 sided die represents hit chance it has nothing to do with damage...

Here are the chances to get at least a certain number in a d20

1 -> 100%
2 -> 95%
3 -> 90%
4 -> 85%
5 -> 80%
6 -> 75%
7 -> 70%
8 -> 65%
9 -> 60%
10 -> 55%
11 -> 50%
12 -> 45%
13 -> 40%
14 -> 35%
15 -> 30%
16 -> 25%
17 -> 20%
18 -> 15%
19 -> 10%
20 -> 5%

I think you're showing these percentages in the context of a hypothetical attack vs. AC situation, but on its face it seems like you're saying "there is a 100% chance of getting a 1, but only a 5% chance of getting a 20 when you roll a 20-sided die", lol

Nah, he said "Here are the chances to get at least a certain number in a d20..." You just didn't read correctly.