How to work with Portent for replacing enemy rolls

It seems like, RAW, if a Divination Wizard is in the party then the DM would have to ask that player whether they want to interrupt the roll … on every single roll that any NPC makes.

That’s going to be really tedious 🙁 It could also sometimes include rolls that the players might not otherwise know had been made.

Clearly allowing the Wizard to make the call after the roll is known would be hugely broken, as would making a judgement as a DM as to whether they likely want to use it.

How do DMs normally handle that?

Is there any balanced way to apply Portent after the initial roll?

if you use Enhance Ability: Cat’s Grace on a creature that rolls initiative, does that creature lose the better roll when the spell ends?

Let’s say the caster uses Enhance Ability and chooses Cat’s Grace on themselves and rolls a 13 and a 16 with advantage on initiative, so they take 16. If the caster then loses Enhance Ability in-combat, or ends concentration on that spell, does their initiative roll revert to 13?

What abilities allow me to reroll or replace die rolls?

I am building a “lucky wizard” for my newest campaign.

The concept is to use abilities and features that allow me to reroll (or replace rolls) attacks, abilities, and/or saving throws (such as the Lucky feat). I’m not interested in abilities that allow rerolls on allies’ or enemies’ rolls.

My search so far has yielded a few options, but I am unsure if I’ve missed any.

  • Portent (Divination Wizard)
  • The Lucky feat
  • Lucky (Halfling racial trait)

Are there others?

How to create dice rolls for multi-attacks in a custom tabletop RPG system

I’m working on a simple tabletop RPG based in a sci-fi universe. The rule set is very basic, since I’ll be playing with players with little experience and general tabletop know-how.

Most of it appears to be working fine, based on a test session. The only problem I’m having are attacks that hit multiple times.

Unlike most fantasy RPGs, you can wield weapons that fire e.g. 10 bullets in a single attack. For example, with an assault rifle, you can do a single shot, a short burst or hold down the trigger for fully automatic fire. Single shot is of course the most accurate, burst is less accurate and fully automatic is only accurate for the first few bullets.

I want to know how many bullets hit before calculating the damage. A normal attack roll is a normal 1d20 roll with modifiers against a DC (default 20), e.g. 1d20 + x has to be higher than 20. Afterwards, a damage dice is added for every bullet that hits, e.g. 1d6 for a single bullet, 2d6 for 2 hits, and so on. Characters can wear bullet proof vests that reduce the damage of every bullet, not for the full attack.

On one hand, I could add a "burst damage" and a "full auto damage" stat to the weapons, e.g. a weapon does 1d6 damage single shot, 2d6 burst or 5d6 full auto, but that makes full auto always the superior option, outside of the ammunition/reload mechanics.

I could roll every bullet separately, but that would result in a lot of rolls and/or calculations if I add modifiers to every roll. I thought about reversing it and making the DC DC - modifiers, and just rolling a d20 for every bullet, then counting all that are above the modified DC, but that also favors attacks with lots of bullets, unless I increase the DC for attacks with more bullets by some amount, though what should be the modifiers to achieve the expected result?

My current solution is to have players make a normal attack roll with the weapon specific maximum amount of bullets shot per attack type as negative modifier, and for every point above the DC, one bullet hits, up to the weapon specific number of bullets per attack type. For example, with a normal attack modifier of 10, a roll of 15 and a maximum of 3 bullets to hit with, the player could roll 2d6 for damage (15 (1d20 roll) + 10 (modifier) - 3 (max burst bullets) - 20 (DC) = 2 hits). This works, but it’s fairly clumsy and still favors full auto. I thought about increasing the DC of burst to 21 and full auto to 22, to reduce the effectiveness, but it still feels clumsy.

My intention is for single shot to be a safe and reliable choice, burst to be common and full auto to be high risk, high reward. How can I transform that into dice roll rules with a small amount of individual rolls?

Ideally:

  • With a high modifier (>15), full auto should have the highest expected damage per attack.
  • With a medium modifier (10-15), burst should have the highest expected damage per attack.
  • With a low modifier (<10), single shot should have the highest expected damage per attack.

Answers that use math to model the expected damage would be preferred. You can use 1d6 as damage per bullet, 3 bullets per burst and 6 bullets per full auto attack.

If a player rolls 33-34 on the wild magic table (maximize damage), what happens if they miss the target on the damaging attack?

On the Wild Magic Sorcerer’s Wild Magic Table, (PHB p.104), getting a roll of 33-34 results in:

Maximize the damage of the next damaging spell you cast within the next minute.

What happens if the sorcerer casts an attack roll spell that deals damage, and misses the target? I am being confused by the term "damaging." Is a "Damaging Spell" a hidden category of spell that can be cast, and thus means casting the spell ends this effect? or does the spell need to apply damage in order to be damaging, and would therefore need to hit for the effect to happen?

Can a Divination wizard in the Border Ethereal use the Portent feature to influence rolls of creatures on the Material Plane?

A particular School of Divination wizard is native to the Ethereal Plane (he was created by a wish spell replicating simulacrum cast on that plane).

While this wizard is in the Border Ethereal, can he use his Portent feature to affect the rolls of creatures on the Material Plane?

How can I add a seperate damage dice to my hombrew magic item so that it rolls two separate dice on beyond’s new dice roller?

Got curious for when my paladin reaches lvl 11/2 warlock and gets a permanent 1d8 divine smite all the time. My main weapon is magical gifted by my patron so im looking to see if it’s possible to add the extra dice as a feature so it’s properly displayed and usable in dnd beyonds dice roller feature. I can’t figure out the right combo in the magic item creation page.

A player rolls four 20-sided dice, takes the lowest value, ignores the rest. What is the probability of this value at least 7?

I’m designing a tabletop game, and I need to figure out how to calculate a few probabilities:

  1. Roll 3 20-sided dice, take the highest value. What is the probability of it being 7 or higher? 15 or higher?
    1. Roll 4 20-sided dice, take the highest value. What is the probability of it being 7 or higher? 15 or higher?
    1. Roll 3 20-sided dice, take the lowest value. What is the probability of it being 7 or higher? 15 or higher?
    1. Roll 4 20-sided dice, take the lowest value. What is the probability of it being 7 or higher? 15 or higher?

How can I do this? Could you explain to me how this works, or even better – give me a simple formula?