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Message: <blockquote data-quote="p_johnston" data-source="post: 8499561" data-attributes="member: 7016849">So the two things being compared would be SB vs a theoretical spell that acts in the same manner except that instead of a reroll you can use it to cause the target to roll with disadvantage, meaning you have to decide before the initial roll.Assuming a flat roll that already didn't have advantage or disadvantageTaken as a chance from the start of the ability that they have to save against to the resolution of that ability the effects of both spells would be that the opponent rolls 2d20 and if either are a failure that is the one the use. The only difference is the point at which you decide to use the spell. With disadvantage you would have to use it before they roll anything. With SB you decide after they have rolled 1d20.Since you want numbers let's look at the simplest example. DC 16 and they have a +5. an even 50/50 chance of failure or success.Making the save with no outside interference: .5Making the save if they have disadvantage: .25Making the save if they have advantage: .75Silvery barbs If the have neither advantage nor disadvantage: .25 (they have a .5 chance of Success. Of the .5 chance of success they will re-roll with a new .5 chance of failure meaning that they will end up with only a .25 chance of success)Silvery barbs when they have disadvantage: .0625 (they have a .25 chance of Success. Of the .25 chance of success they will re-roll with a new .25 chance of success endings up with .0625 chance of success.)Silvery barbs when they have advantage: .5625 (they have a .75 chance of Success. Of the .75 chance of success they will re-roll with a new .75 chance of success endings up with .5625 chance of success.)To put it into the simplest possible terms.Assuming a flat roll with no advantage or disadvantage before hand when a person uses SB to make an opponent re-roll a save or an ability causes that opponent to roll with disadvantage the opponent is doing the exact same thing. They are taking 2d20 and taking whichever one would make the save a failure.Edit: So I made the post with (possibly) a slight misunderstanding of how Silvery Barbs works. Based on wording when rolling with Advantage/Disadvantage it would be reasonable to say they only re-roll only a single dice and use that result if it would be lower.So the math based on that.Silvery barbs when they have disadvantage: .125 (they have a .25 chance of Success. Of the .25 chance of success they will re-roll with a new .5 chance of success endings up with ..125 chance of success.)Silvery barbs when they have advantage: .375 (they have a .75 chance of Success. Of the .75 chance of success they will re-roll with a new .5 chance of success endings up with .375 chance of success.)If anything that particular ruling would make SB even better because it also effectively let's you bypass Magic Resistance or anything else that would give advantage on the save.</blockquote>

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